Foundations of Astronomy
13th Edition
ISBN: 9781305079151
Author: Michael A. Seeds, Dana Backman
Publisher: Cengage Learning
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Textbook Question
Chapter 20, Problem 5P
How many magnetic pole reversals has Earth endured in the last 330 million years if the average time between reversals is 700,000 years?
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How many magnetic pole reversals has Earth
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The majority of the research shows that tectonic plates move at the average rate of between approximately 0.60 cm/yr to 10 cm/yr. (a) What distance does it move in 1 s at this speed range? (b) What is its speed in kilometers per million years?
For B and C, the depth is 30.0KM - Not 25 KM !!! Please help!
Chapter 20 Solutions
Foundations of Astronomy
Ch. 20 - Why would you include the Moon in a comparison of...Ch. 20 - Prob. 2RQCh. 20 - Which is the most geologically active Terrestrial...Ch. 20 - In what ways is Earth unique among the Terrestrial...Ch. 20 - Which Terrestrial worlds have thin or no...Ch. 20 - Describe the four stages of Terrestrial planet...Ch. 20 - The Moon did not pass through all of the four...Ch. 20 - Earth shows few craters on its surface. What is...Ch. 20 - How do you know that Earth is differentiated?Ch. 20 - What keeps Earths interior warm today?
Ch. 20 - Lava flows today are examples of basin flooding....Ch. 20 - Describe three forms of erosion that cause slow...Ch. 20 - Prob. 13RQCh. 20 - Which type of seismic wave cannot pass through...Ch. 20 - Prob. 15RQCh. 20 - Which of the five Terrestrial worlds have bow...Ch. 20 - How is the root cause of earthquakes in Hawaii...Ch. 20 - What characteristics must Earths core have to...Ch. 20 - Which of the five Terrestrial worlds have plate...Ch. 20 - Prob. 20RQCh. 20 - How do island chains located in the centers of...Ch. 20 - What evidence can you give that the Atlantic Ocean...Ch. 20 - How are the inferred properties of Earths original...Ch. 20 - Prob. 24RQCh. 20 - Prob. 25RQCh. 20 - Life on Earth exists because of oxygen in Earths...Ch. 20 - Prob. 27RQCh. 20 - Prob. 28RQCh. 20 - Prob. 29RQCh. 20 - Prob. 30RQCh. 20 - Prob. 31RQCh. 20 - Prob. 32RQCh. 20 - Why would a decrease in the density of the ozone...Ch. 20 - How Do We Know? How can the flow of energy out of...Ch. 20 - Prob. 35RQCh. 20 - Prob. 1DQCh. 20 - Prob. 2DQCh. 20 - Prob. 3DQCh. 20 - Prob. 4DQCh. 20 - Prob. 5DQCh. 20 - Prob. 6DQCh. 20 - Look at Figure 19-3. The earthquake occurred 7440...Ch. 20 - Look at Figure 19-3. The lag time is the...Ch. 20 - What percentage of Earths volume is the metallic...Ch. 20 - How many magnetic pole reversals has Earth endured...Ch. 20 - If the Atlantic seafloor is spreading at 3.0...Ch. 20 - The Hawaiian-Emperor chain of undersea volcanoes...Ch. 20 - From Hawaii to the bend in the Hawaiian-Emperor...Ch. 20 - Prob. 9PCh. 20 - Prob. 1LTLCh. 20 - Look at the hemispheres of Earth shown on the two...Ch. 20 - Prob. 3LTLCh. 20 - Look at Figure 19-9. Rising from Earths surface to...Ch. 20 - Prob. 5LTLCh. 20 - What do you see in this photo that suggests heat...
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- Over the entire Earth, there are 60,000 km of active rift zones, with average separation rates of 5 m/ century. How much area of new ocean crust is created each year over the entire planet? (This area is approximately equal to the amount of ocean crust that is subducted since the total area of the oceans remains about the same.)arrow_forwardAll I need help with is to find the outer core and inner core percentage and the thinkness of them too.arrow_forwardAn expert already gave me the answers but I don't understand that. Now I just need the numberd that goes in the box. The outer cour and innerarrow_forward
- If a tectonic plate is moving at 8.4 cm per year and a string of volcanoes appearing in the middle of the plate is 4,000 km long, how old is the oldest volcano (in millions of years)?arrow_forwardA chain of undersea volcanoes has a length of 7,400 km today and the first volcano formed 53 million years ago. How fast is the plate moving each year? (Enter your answer in cm/yr.)arrow_forwardThe Earth has an approximate mass of 5.97*10^24 kg and a radius of 6,300 km. If the crust accounts for 31% of the mass and its radius is 2 times smaller, then the density of the core in kg/m3 must be approximatelyarrow_forward
- You analyze a sample of a meteorite that landed on Earth and find that 7/8 of the uranium-238 radioactive atoms have decayed into lead-206. What is the age of the sample (in years) if the half-life of uranium-238 is 4.5 billion years?arrow_forwardThe Earth's mid-ocean ridges create about 1.029 cm of new crust over their 1943 km length every year. How much new crustal area (in km2) will this process create in 108 years?arrow_forwardAn earthquake occurs 6,875 km from a seismograph. The P-waves arrive 11.6 minutes later. How fast is the P-wave traveling (in km/s)? If the lag time between P- and S-waves is 10.8 minutes, how fast are the S-waves traveling (in km/s)? Using the shadow of S-waves you determine that the radius of the core is 55% of the Earth's 6,378-km radius. How many kilometers from the surface is this (in km)? To calculate how fast the P-waves are traveling, we need to divide the distance the waves travel by the time. vP = d s vP = km/sarrow_forward
- Given that the half-life of carbon-14 is 5,730 years. Consider a sample of fossilized wood that when alive, would have contained 24 gm of carbon-14. It now contains 1.5 gm of carbon-14. How old is the sample?arrow_forwardWhat is the volume of new oceanic basalt added to Earth’s crust each year? Assume that the thickness of the new crust is 5 km, that there are 60,000 km of rifts, and that the average speed of plate motion is 4 cm/y. What fraction of Earth’s entire volume does this annual addition of new material represent?arrow_forwardWhich type of seismic wave cannot pass through Earths core? What does that indicate about the composition of the core?arrow_forward
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