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Unit 4 Tsunamis Unit 4. Part 1. Question 1. Watch the Unit 4 Part 1 lecture video and answer the following question: Though it might help, why is it generally not sufficient to be a good swimmer to survive a tsunami? a. Because the water generally carries large amounts of debris b. Because the currents will be too swift even for the strongest swimmers c. Because the water will eventually drag everything back out to sea d. Because people in the water will suffer heat loss (hypothermia) Unit 4. Part 1. Question 2. Watch the Unit 4 Part 1 lecture video and answer the following question: What component experiences elastic rebound during a subduction zone earthquake? a. The overriding plate b. The subducting plate c. Both plates d. Neither plate Unit 4. Part 1. Question 3. Watch the Unit 4 Part 1 lecture video and answer the following question: Generally, how big does a subduction zone earthquake have to be to generate a large tsunami? a. M9 b. M8 c. M7 d. M6 Unit 4. Part 1. Question 4. Watch the Unit 4 Part 1 lecture video and answer the following question: True or False: Like wind-blown waves, tsunami waves traveling through the deep ocean are not influenced by seafloor topography. a.True b. False Unit 4. Part 2. Question 5. Watch the Unit 4 Part 2 lecture video and answer the following question: What happens to a tsunami wave as it moves from deep to shallow water? a. It speeds up and increases in height b. It speeds up and decreases in height c. It slows down and increases in height d. It slows down and decreases in height

Unit 4. Part 2. Question 6. Watch the Unit 4 Part 2 lecture video and answer the following question: When traveling through the deep Pacific Ocean, how high did the 2011 Japan tsunami reach? a. Less than 1 meter b. About 4 meters c. About 8 meters d. More than 10 meters Unit 4. Part 2. Question 7. Watch the Unit 4 Part 2 lecture video and answer the following question: When will a wave moving toward shore typically break (crash down from its tallest height)? a. When the water depth decreases to ~6 ft b. When the wave moves over a sharp upward slope in the seafloor c. When the water depth is equal with the wavelength of the wave d. When the water depth is equal to the wave height Unit 4. Part 2. Question 8. Watch the Unit 4 Part 2 lecture video and answer the following question: What type of shoreline topography leads to the greatest buildup of tsunami water heights? a. Natural harbors b. Flat plains c. River deltas d. Sand dunes Unit 3. Part 3. Question 9. Watch the Unit 4 Part 3 lecture video and answer the following question: True or False: An earthquake on the San Andreas Fault cannot cause a large tsunami. True False Unit 3. Part 3. Question 10. Watch the Unit 4 Part 3 lecture video and answer the following question: True or False: Tsunami waves can travel many kilometers inland and continue to come in for 10s of minutes. True False

Unit 4. Part 4. Question 1. Watch the Unit 4 Part 4 lecture video and answer the following question: What is a Japanese tsunami stone? a. A stone carved with a warning as to where the water reached during a specific tsunami b. A stone carried by the water into a structure causing damage c. A stone from the seafloor carried far inland d. A stone buried by sand deposits Unit 4. Part 4. Question 2. Watch the Unit 4 Part 4 lecture video and answer the following question: How do we know that the Washington and Oregon coasts have experienced numerous large tsunamis in the past? a. From recognizable ancient erosion surfaces. b. From the writings of early European settlers c. Because we know that the region has experienced large earthquakes in the past. d. Trenches dug inland of beaches reveal buried sand deposits Unit 4. Part 4. Question 3. Watch the Unit 4 Part 4 lecture video and answer the following question: What happens at the seashore if a tsunami wave trough arrives before the wave crest? a. It will reduce the eventual size of the tsunami wave b. It will double the size of the tsunami wave to follow c. Water levels near the shoreline will drop d. Water levels near the shoreline will rise Unit 4. Part 4. Question 4. Watch the Unit 4 Part 4 lecture video and answer the following question: Why is it safe to return to the beach after a tsunami wave first arrives and has already caused damage? a. Because a tsunami generally consists of only one wave b. Because the water will have put out any fires c. Because earthquakes occur before, not after tsunamis d. It is not safe to return to the beach because tsunamis consist of several waves Unit 4. Part 4. Question 5. Watch the Unit 4 Part 4 lecture video and answer the following question: How does the DART system detect tsunamis? a. A surface buoy that senses when a broad wave passes. b. A satellite measures wave heights and detects the tsunami by its long wavelength. c. An instrument detects water pressure change on the seafloor. d. All the above

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Unit 4. Part 5. Question 6. Watch the Unit 4 Part 5 lecture video and answer the following question: What was special about the Lituya Bay tsunami? a. It created the highest runup of any recorded tsunami b. It is rare for an avalanche to generate a tsunami c. It sank more than 100 ships d. All the above Unit 4. Part 5. Question 7. Watch the Unit 4 Part 5 lecture video and answer the following question: When the Åkerneset landslide occurs, how much time will the town of Geiranger have to evacuate before the tsunami hits? a. 1 minute b. 3 minutes c. 10 minutes d. 30 minutes Unit 4. Part 6. Question 8. Watch the Unit 4 Part 6 lecture video and answer the following question: If an avalanche off the side of the Canary Islands generated a tsunami, which coastline would be in danger? a. The US west coast b. The US east coast c. The east coast of Africa d. Every coastline in the Indian Ocean Unit 4. Part 6. Question 9. Watch the Unit 4 Part 6 lecture video and answer the following question: What was wrong with the name of the movie "Krakatoa East of Java"? a. Krakatoa was not the name of the volcano that exploded b. Krakatoa is west of Java c. Krakatoa is not anywhere near Java d. Krakatoa is in Java Unit 4. Part 6. Question 10. Watch the Unit 4 Part 6 lecture video and answer the following question: In the movie Deep Impact, what was wrong about the depiction of the asteroid-induced tsunami? a. The wave was not high enough b. The wave should have broken far out at sea c. Water is never drawn out to sea prior to a tsunami reaching shore d. All the above

Unit 5 Volcanoes 5.1. In Wikipedia, look up "Lava" and answer this question: What is the difference between lava and magma? a. The two terms have the same meaning. b. Magma is melted rock beneath the surface, lava is melted rock extruded onto the surface. c. Lava is melted rock beneath the surface, magma is melted rock extruded onto the surface. d. Lava is a specific kind of magma that has a ropy texture. 5.2. In Wikipedia, look up "Magma", read the intro then scroll down to "Decompression", and answer this question: What is decompression melting? a. When adding water to rocks lowers their melting temperature b. When increasing the temperature of rocks leads to melting c. When decreasing the pressure on rocks lowers their melting temperature d. All the above 5.3. In Wikipedia, look up "Magma", read the intro then scroll down to "Effects of water and carbon dioxide", and answer this question: What does the addition of water to hot rocks in the mantle cause? a. It causes their temperature to decrease b. It causes their temperature to increase c. It causes their melting (solidus) temperature to decrease d. It causes their melting (solidus) temperature to increase 5.4. In Wikipedia, look up "Volcanic arc" and answer this question: In which tectonic settings is magma caused by water lowering the melting temperature of rock? a. Subduction zones b. Mid-ocean ridges c. Hot spots d. All the above 5.5. In Wikipedia, look up "Ring of Fire" and answer this question: What is the ring of fire? a. A region around much of the rim of the Pacific Ocean where many volcanic eruptions occur. b. A ring of lava caused when a lava pours down evenly on all sides of a volcano.

c. A ring-shaped ash cloud that occurs because of convection currents in the atmosphere. d. A ring of fire caused when a burning ember from a volcanic explosion ignites a grass fire. 5.6. In Wikipedia, look up "Hotspot (geology)" and answer this question: Why do hot spots lead to a chain of volcanoes? a. Because hot spots are constantly moving b. Because hot spot lava generally flows in one direction c. Because hot spot magma chambers form as a long line d. Because tectonics plates move over stationary hot spots 5.7. In Wikipedia, look up "Viscosity" and answer this question: What is viscosity a measure of? a. The surface tension of a fluid b. The resistance of a fluid to flow c. The buoyancy of a fluid d. The melting temperature of a fluid 5.8. In Wikipedia, look up "Shield volcano" and answer this question: What is the viscosity of the lava that forms shield volcanoes? a. Low viscosity (highly fluid) b. Medium viscosity c. High viscosity (very sticky) 5.9. In Wikipedia, look up "Tephra" and answer this question: What is Tephra? a. Lava flows made of up clinkers (porous lava rocks that clink when they make contact) b. Fragmental material (as opposed to lava) produced by a volcanic eruption c. Ash that has been fused into solid rock d. A steep conical hill of loose pyroclastic fragments 5.10. In Wikipedia, look up "Stratovolcano" and answer this question: How do stratovolcanoes formed? a. By successive lava flows b. By successive piles tephra c. By alternate lava flows and tephra d. By the collapse of the magma chamber

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5.11. In Wikipedia, look up "Types of volcanic eruptions" and answer this question: Which is the calmest type of volcanic event? a. Hawaiian b. Strombolian c. Vulcanian d. Plinian 5.12. In Wikipedia, look up "Types of volcanic eruptions" and answer this question: Which is the most explosive type of volcanic eruption? a. Hawaiian b. Strombolian c. Vulcanian d. Plinian 5.13. In Wikipedia, look up "Soft drink", read the intro then scroll down to "Carbonated drinks" and answer this question: Carbonated drinks contain dissolved carbon dioxide, mean that the carbon dioxide is in liquid form due to them being under pressure. What happens when the pressure is removed? (In case you are wondering, this process is exactly analogous to what happens to dissolved gas in magma when the pressure on the magma is reduced.) a. The carbonated drink explodes. b. The carbon dioxide is released from the solution as small bubbles. c. The temperature drops. d. The carbon dioxide disappears. 5.14. In Wikipedia, look up "Pumice" and answer this question: What is pumice? a. A fast-moving current of hot gas and volcanic matter (collectively known as tephra) that flows along the ground away from a volcano. "Volcanic ash" b. A violent type of mudflow that flows down from a volcano. c. Fragments of rock, minerals, and volcanic glass, created during volcanic eruptions and measuring less than 2 mm in diameter. d. A volcanic rock that consists of highly vesicular rough textured volcanic glass. e. A mass of molten rock larger than 2.5 inches in diameter formed when a volcano ejects lava during an eruption

Quiz 9: Unit 5. Part 1. Question 1. Watch the Unit 5 Part 1 lecture video and answer the following question: In the movie Volcano, what does Dr. Amy Barnes get wrong about volcanism? a. Earthquakes can cause volcanic eruptions b. Volcanism can rapidly heat bodies of water c. Tectonic plates float on an ocean of molten rock d. All the above Quiz 9: Unit 5. Part 1. Question 2. Watch the Unit 5 Part 1 lecture video and answer the following question: Which process will not cause hot rocks to melt? a. Increasing temperature b. Increasing pressure c. Increasing water content d. All the above will cause hot rocks to melt Quiz 9: Unit 5. Part 1. Question 3. Watch the Unit 5 Part 1 lecture video and answer the following question: How does adding water cause a hot rock to melt? a. By decreasing the pressure on the rock b. By breaking long silica chains causing the melting temperature to decrease c. By increasing the temperature of the rock d. All the above Quiz 9: Unit 5. Part 1. Question 4. Watch the Unit 5 Part 1 lecture video and answer the following question: What process causes volcanism at subduction zones? a. An increase in mantle temperatures b. Depressurized melting

c. Hydration induced melting d. All the above Quiz 9: Unit 5. Part 1. Question 5. Watch the Unit 5 Part 1 lecture video and answer the following question: What process causes volcanism at hotspots? a. An increase in mantle temperatures b. Depressurized melting c. Hydration induced melting d. All the above Quiz 9: Unit 5. Part 1. Question 6. Watch the Unit 5 Part 1 lecture video and answer the following question: What is a consequence of tectonic plates moving over hotspots? a. Long chains (tracks) of volcanoes b. Larger volcanoes c. More explosive volcanoes d. The plates slow down Quiz 9: Unit 5. Part 2. Question 7. Watch the Unit 5 Part 2 lecture video and answer the following question: What type of volcanoes are generated by low viscosity magmas? a. Shield volcanoes b. Stratovolcanoes c. Cinder cones d. All the above Quiz 9: Unit 5. Part 2. Question 8. Watch the Unit 5 Part 2 lecture video and answer the following question: What kind of volcanoes are generated when tephra is thrown out of their vents? a. Shield volcanoes b. Stratovolcanoes c. Cinder cones

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d. All the above Quiz 9: Unit 5. Part 2. Question 9. Watch the Unit 5 Part 2 lecture video and answer the following question: What combination of gas content and viscosity leads to explosive eruptions? a. Low gas content, low viscosity b. Low gas content, high viscosity c. High gas content, low viscosity d. High gas content, high viscosity Quiz 10: Unit 5. Part 3. Question 1. Watch the Unit 5 Part 3 lecture video and answer the following question: Which is the most dangerous hazard near a volcano? a. Lava b. Pyroclastic flow c. Mudflow d. Tephra Quiz 10: Unit 5. Part 3. Question 2. Watch the Unit 5 Part 3 lecture video and answer the following question: True or False: It is possible to stop a lava flow by spraying water on it. True False Quiz 10: Unit 5. Part 3. Question 3. Watch the Unit 5 Part 3 lecture video and answer the following question: Which of the following is not a characteristic of volcanic ash? a. It is electrically conductive b. It is fluffy like the ash found after burning wood c. 5 cm can kill crops d. It is smaller than sand grains

Quiz 10: Unit 5. Part 3. Question 4. Watch the Unit 5 Part 3 lecture video and answer the following question: What are volcanic bombs? a. Pieces of cooled volcanic rock blasted from the volcano during an eruption. b. Balls of hot lava that explode on impact. c. High pressure volcanic gas pockets that can explode on the ground long after the lava flow has cooled. d. Hollow chunks of lava thrown out of volcanoes with dragons in them. Quiz 10: Unit 5. Part 4. Question 5. Watch the Unit 5 Part 4 lecture video and answer the following question: What is a pyroclastic flow? a. Very low viscosity lava flows that can travel many miles before cooling. b. A lava flow that carries large chunks of cooled rock with it. c. An avalanche of ash, soil, rock, and water. d. The heavier parts of an explosive eruption that runs down the flank of a volcano. Quiz 10: Unit 5. Part 4. Question 6. Watch the Unit 5 Part 4 lecture video and answer the following question: What is a lahar? a. Very low viscosity lava flows that can travel many miles before cooling. b. A lava flow that carries large chunks of cooled rock with it. c. An avalanche of ash, soil, rock, and water. d. The heavier parts of an explosive eruption that runs down the flank of a volcano.

Quiz 10: Unit 5. Part 4. Question 7. Watch the Unit 5 Part 4 lecture video and answer the following question: True or False: Some towns near Mt. Rainier are built in the path of ancient volcanic mudflows. True False Quiz 10: Unit 5. Part 5. Question 8. Watch the Unit 5 Part 5 lecture video and answer the following question: What killed almost 2000 people in Cameroon in 1986? a. A pyroclastic flow b. A lahar c. A carbon dioxide gas cloud d. Ash fallout Quiz 10: Unit 5. Part 5. Question 9. Watch the Unit 5 Part 5 lecture video and answer the following question: What does harmonic tremor reveal? a. That magma is on the move underground. b. That a volcanic eruption will occur within a few minutes. c. That the magma has a low viscosity d. That the magma has a high gas content Unit 6 Supervolcano 6.1. In Wikipedia, look up "Mount Vesuvius" and answer this question: What kind of volcano is Mount Vesuvius? a. It is a stratovolcano b. It is shield volcano

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c. It is a cinder cone d. None of the above 6.2. In Wikipedia, look up "Pompeii" and answer this question: Why is Pompeii interesting to study? a. Because it was buried under 4 to 6 m of volcanic ash and pumice in the eruption of Mount Vesuvius in AD 79 b. Because it was largely preserved under the ash such that the excavated city offered a unique snapshot of Roman life, frozen at the moment it was buried. c. Because the decayed bodies of the dead left voids in the ash which archaeologists found could be used as molds to make plaster casts of these people in their final moments of life. d. All the above 6.3. In Wikipedia, look up "Pompeii", read the intro then scroll down to "Eruption of Vesuvius", and answer this question: What is the currently theory as to the main cause of death of the inhabitants of Pompeii? a. Suffocated by ash b. Exposure to extreme heat from pyroclastic flows c. Drowned by a volcanic induced tsunami d. Toxic gases 6.4. In Wikipedia, look up "Pompeii", read the intro then scroll down to "Rediscovery and excavations", and answer this question: What caused the numerous voids found in the ash layers? a. Volcanic gases b. Erosion from underground water

c. Spaces left by the decomposed bodies d. The settling of lower ash layers 6.5. In Wikipedia, look up "Eruption of Mount Vesuvius in 79 AD" and answer this question: Which of the following is a characteristics of the eruption? a. Earthquakes occur before the eruption b. The eruption lasted two days c. It consisted of multiple pyroclastic flows d. All the above 6.6. In Wikipedia, look up "Pompeii", read the intro then scroll down to "Eruption of Vesuvius", and answer this question: Who wrote his eyewitness account of the destruction of Pompeii by Vesuvius? a. Pliny the Younger b. Pliny the Elder c. Marcus Vergilius Eurysaces d. Titus 6.7. In Wikipedia, look up "Yellowstone National Park" and answer this question: Which of the following statement is true about Yellowstone? a. It was the first national park in the U.S. and is also widely held to be the first national park in the world. b. It is the largest supervolcano on the continent. c. It contains over half of the world's geysers and hydrothermal features. d. All the above

6.8. In Wikipedia, look up "Geyser" and answer this question: Where does the heat that leads to the steam that powers the geyser generally originate from? a. A magma chamber b. Earth's hot lower crust c. Earth's hot mantle d. Earth's hot outer core 6.9. In Wikipedia, look up "Yellowstone hotspot", click to enlarge the figure with the caption "Past locations of the hotspot in millions of years", and answer this question: We know that Yellowstone is a hot spot because it the latest in a chain of volcanoes. How long ago did the first volcanic eruption occur in this chain? a. About 2 million years ago b. About 10 million years ago c. About 16 million years ago d. About 25 million years ago 6.10. In Wikipedia, look up "Volcanic Explosivity Index", and answer this question: The Volcano Explosivity Index (VEI) rates the relative explosiveness of volcanoes. Which of the following is this rating based on? a. The volume of lava b. The volume of explosive products c. The size of the explosive crater d. The number of fatalities 6.11. In Wikipedia, look up "Caldera" and answer this question: True or False: A caldera forms when a volcanic eruption explodes the top off of a volcano. True False

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6.12. In Wikipedia, look up "Crate Lake, OR" (make sure this is the one about the lake in Oregon as there are several) and answer this question: Which of the following are true about Crater Lake? a. There are no rivers flowing into or out of this lake. b. It is the deepest lake in the U.S. c. It partially fills a caldera that formed when Mount Mazama erupted 7,700 years ago. d. All the above 6.13. In Wikipedia, look up "Yellowstone Volcano Observatory", and answer this question: Which of the following is not part of the purpose of the observatory? a. To view stars in far off galaxies. b. To monitor the volcanic system c. To increase our scientific understanding of the Yellowstone volcanic and hydrothermal system. d. To disseminate data, interpretations, and accumulated knowledge to the public. 6.14. In Wikipedia, look up "Mount Pinatubo" and answer this question: Aerosol (small particles) ejected by the 1991 eruption of Mount Pinatubo in Philippines blocked sunlight leading to global cooling. How much did the Earth cool in the years following the eruption? a. 0.5 deg C b. 1.0 deg C c. 2.0 deg C d. 3.0 deg C 6.15. In Wikipedia, look up "1815 eruption of Mount Tambora" and answer this question: Which of the following is not true about the 1815 eruption of Mount Tambora? a. It was the most powerful volcanic eruption in recorded

human history. b. It had an explosive rating of VEI 8. c. It caused a brief period of significant climate change that triggered extreme weather and harvest failures in many areas around the world. d. The eruption left behind a caldera 6-7 km across. 6.16. In Wikipedia, look up "Year Without a Summer" and answer this question: The 1815 eruption of Mount Tambora caused global cooling in 1816 which is referred to as the Year without a summer. Which of the following monsters were not created by their authors out of the gloom of that summer? a. Frankenstein b. Vampires c. Werewolves d. All the above were created in the summer of 1816 6.17. In Wikipedia, look up "Volcanic winter" and answer this question: What is a volcanic winter? a. When ash covers the ground making it look like a snowfall. b. A reduction in global temperatures caused by volcanic ash and droplets of sulfuric acid obscuring the Sun. c. The prevalence of volcanic eruptions to occur during winter because of the pressure of large snowfalls increases pressure on the magma chamber. d. Specifically refers to times when volcanic eruptions prevent summer from occurring. 6.18. In Wikipedia, look up "Toba catastrophe theory" and answer this question: What is the bottleneck theory? a. That the Toba eruption was so big because pressure was trapped by a narrow conduit from the magma chamber to the surface.

b. That the Toba eruption cause global warming that led to an explosion in the population of humans. c. The Toba eruption caused a tsunami so large that it split Indonesia in two making it look like a bottleneck in its center. d. That global cooling associated with the Toba eruption reduced human populations to a dangerously small number. 6.19. In Wikipedia, look up "Flood basalt" and answer this question: What of the following is true about flood basalts? a. They are result of a giant volcanic eruption or series of eruptions that cover large stretches of land or the ocean floor with lava. b. They have been attributed to the onset of a hotspot reaching the surface of the earth via a mantle plume. c. They have been connected to mass extinction events. d. All the above 6.20. In Wikipedia, look up "Deccan Traps", and answer this question: True or False: The dinosaurs went extinct 65 million years ago during the Cretaceous-Paleogene extinction event. Recent research suggests that these extinctions might have been caused by a combination of an asteroid impact and a large igneous province (lava flow) initiated by the impact. True False Unit 6 Volcanic Castotrophies Quiz 11: Unit 6. Part 1. Question 1. Watch the Unit 6 Part 1 lecture video and answer the following question: In 79 AD an eruption of Mt. Vesuvius destroyed Pompeii. Why is this event so interesting? a. It caused the largest death toll of any volcanic eruption.

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b. It was the most power volcanic explosion in history c. Pompeii was preserved by up to 80 ft ash and dugout, including preserved forms of the dead . d. All the above Quiz 11: Unit 6. Part 1. Question 2. Watch the Unit 6 Part 1 lecture video and answer the following question: How is magma generated beneath Mt. Vesuvius? a. By an increase in temperature b. From depressurized melting c. From hydration-induced melting d. From hotspot volcanism Quiz 11: Unit 6. Part 1. Question 3. Watch the Unit 6 Part 1 lecture video and answer the following question: How were the bodies found in the ash the covered Pompeii preserved? a. The ash protected them from decaying. b. Mineral rich ground water passing through them turned them into crystals. c. They were fossilized by the heat and pressure of the overlying ash. d. The bodies decayed. Only their bones survived within an empty volume of where their bodies were. Quiz 11: Unit 6. Part 1. Question 4. Watch the Unit 6 Part 1 lecture video and answer the following question: Who was Pliny the Younger? a. A naturalist and commander of the Roman Navy in the Bay of Naples who died trying to rescue victims of the Mt. Vesuvius eruption. b. A magistrate of ancient Rome who wrote down an unbelievable account of the eruption of Mount Vesuvius and the destruction of Pompeii . c. The mayor of Pompeii who led many people to safety during the eruption of Mt. Vesuvius.

d. The first volcanologist who warned of the impending eruption of Mt. Vesuvius years before it erupted. Quiz 11: Unit 6. Part 2. Question 5. Watch the Unit 6 Part 2 lecture video and answer the following question: Based on DNA evidence, what did artists, writers, and screenwriters get wrong about "The Lovers" which they based their stories on? a. They were just good friends b. They were two strangers c. They were actually two men d. They were brothers Quiz 11: Unit 6. Part 2. Question 6. Watch the Unit 6 Part 2 lecture video and answer the following question: In the movie Pompeii, Why was the depiction of Mt. Vesuvius in the days leading up to the 79 AD explosive eruption clearly wrong? a. Volcanoes only have craters after they erupt b. Pressure can't build with lava exposed at the surface c. The crater is too deep for lava to reach the surface d. The fire should be blue because of the burning sulfur Quiz 11: Unit 6. Part 3. Question 7. Watch the Unit 6 Part 3 lecture video and answer the following question: True or False: Yellowstone National Park has many large, extinct stratovolcanoes that tourists are able to climb. True False Quiz 11: Unit 6. Part 3. Question 8. Watch the Unit 6 Part 3 lecture video and answer the following question: Why do geysers explosively erupt while hot springs do not? a. Geysers are fed by plumbing with lots of bends b. Hot springs are fed by plumbing with lots of bends c. The water that feeds geysers come from a deeper depth closer to the magma chamber

d. The water that feeds hot springs come from a deeper depth closer to the magma chamber Quiz 11: Unit 6. Part 3. Question 9. Watch the Unit 6 Part 3 lecture video and answer the following question: How do we know Yellowstone is a hotspot? a. From the size of its past eruptions b. From the chemistry of its lavas c. Because it lies at the end of a trail of extinct volcanoes d. All the above Quiz 11: Unit 6. Part 3. Question 10. Watch the Unit 6 Part 3 lecture video and answer the following question: True or False: In addition to large explosive eruptions, Yellowstone has also had a long history of large lava flows demonstrating the variability of its eruptions. True False Quiz 12: Unit 6. Part 4. Question 1. Watch the Unit 6 Part 4 lecture video and answer the following question: The Volcano Explosivity Index (VEI) rates the relative explosiveness of volcanoes. What is this rating based on? a. The volume of lava b. The volume of ash and other rock ejected c. The size of the explosive crater d. The number of fatalities Quiz 12: Unit 6. Part 4. Question 2. Watch the Unit 6 Part 4 lecture video and answer the following question: The 1980 Mt. St. Helens eruption blasted 1 cubic kilometer of rock and ash out of its vent. That's a cube of material 1 km x 1 km x 1 km in size. How much bigger is a supereruption? a. 10 times

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b. 100 times c. 1,000 times d. 10,000 times Quiz 12: Unit 6. Part 4. Question 3. Watch the Unit 6 Part 4 lecture video and answer the following question: What percentage of the United States was covered by at least several centimeters of ash by Yellowstone supereruptions? a. 10% b. 25% c. 50% d. 85%

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