Homework Assignment#2
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San Jose City College *
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015
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Geology
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Apr 3, 2024
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Uploaded by DrKnowledgeElephant25
Homework Assignment #2
GEOL-015
Chapter 4
Page 95: Concept Check 4.1 – #2 North American geologists because much of the supporting evidence had been gathered from the
continents of Africa, South America, and Australia, with which most North American geologists were unfamiliar.
Page 99: Concept Check 4.2 - #1, #2, #4
#1.
The South American and African continents looked like they fit together like puzzle pieces.
#2.
The Mesosaurus was a small aquatic freshwater retile of the Permian period, if it was able to make the journey across the vast Atlantic Ocean, therefore it remains should be more widely distributed. These fossils are not widely distributed so we can assume that S.A. and Africa must have been connected or close to one another during their existence.
#4.
By positioning the continents to form Pangea the southern landmasses were in the southern hemisphere near the South Pole and the northern landmasses were positioned over the equator
which would have allowed for the existence of glaciers in the southern landmasses and lush tropical swaps in the northern landmasses.
Page 116: Concept Check 4.8 - #3, #4
#3.
Northwest
#4.
When magma forms, it preserves current magnetic polarity (normal or reverse). The oceanic floor at the mid-ocean ridges exhibits normal magnetic polarity. However, if you travel away from the ridges you will encounter rocks with reverse polarity and then rocks of normal polarity which are followed by reverse polarity rocks, etc. Vine and Matthews observed that there were symmetrical bands of rocks with similar polarities on each side of every mid-ocean ridge. They hypothesized that the reverse polarized rocks formed at the ridges during the geologic past when the earth's magnetic field had reverse polarization. Their work provided rather elegant proof that seafloor spreading occurs.
Chapter 5
Page 131: Concept Check 5.1 - #1, #4
#1.
An earthquake is a ground shaking caused by the sudden and rapid movement of one block of rock slipping past another along fractures in the Earth's crust, called faults. Most large
earthquakes occur when there are huge amounts of stored energy in the rocks that suddenly are released.
#4.
megathrust fault
Page 138: Concept Check 5.4 - #1, #3
#1.
how intense an earthquake feels.
#3.
32 times more energy
Page 144: Concept Check 5.5 - #4
#4.
Fire - fire can break out with a magnitude of 7.0 Earthquake can create a
firestorm that fans out due to wind Tsunami - earthquake that is triggered at a megathrust fault will create a tsunami
which leads to larger damage Landslide - ground is converted and it slumps away. Major destruction follows.
Chapter 6
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Page 165: Concept Check 6.2 - #2, #4
#2.
viscosity and the gas content
#4.
A volcano fed by highly viscous magma is likely to be a greater threat to life and property than a volcano supplied with very fluid magma because with high viscous magma gas is trapped more in the magma so the gas will build up and then eventually explode, whereas with fluid magma the gas can escape allowing the magma just to flow out of the volcano.
Page 169: Concept Check 6.3 - #1, #3
#1.
Pahoehoe lava flows are generally basaltic in composition and have a smooth, ropy texture whereas Aa lava flows are also generally basaltic in composition and have a jagged, angular, blocky texture.
#3.
The main gases released during a volcanic eruption are water vapor (70%), carbon dioxide (15%), nitrogen (5%), sulfur compounds (5%), and smaller amounts of chlorine, hydrogen, and argon.
Page 187: Concept Check 6.10 - #1
The crustal rocks into which igneous bodies intrude.