Astronomy
1st Edition
ISBN: 9781938168284
Author: Andrew Fraknoi; David Morrison; Sidney C. Wolff
Publisher: OpenStax
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Chapter 8, Problem 24E
Europe and North America are moving apart by about 5 m per century. As the continents separate, new ocean floor is created along the mid-Atlantic Rift. If the rift is 5000 km long, what is the total area of new ocean floor created in the Atlantic each century? (Remember that
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as the pacific tectonic plate subducts under the philippine plate. south america is drifting closer to asia at a rate of approximately 4 centimeters per year. if this drift rate remains constant how much closer will asia and south america be to one another 100 million years from now?
HEIGHT OF A CONTINENT ABOVE THE MANTLE. In the figure below, a
simple model considers a continent as a block (density = 2,800 kg/m^3)
floating in the mantle (density = 3,300 kg/m3). Assuming the continent is
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5.3.
7.4.
9.8
12.
17.
Antarctica is roughly semicircular in shape, with a radius of 2000 km. The average thickness of the ice cover is 3000 m. How many metric tons (1metric ton = 1000 kg) of ice cover Antarctica? (Consider: density of ice = 0.919 gram per cubic centimeter)
Chapter 8 Solutions
Astronomy
Ch. 8 - What is the thickest interior layer of Earth? The...Ch. 8 - What are Earth’s core and mantle made of? Explain...Ch. 8 - Describe the differences among primitive, igneous,...Ch. 8 - Explain briefly how the following phenomena happen...Ch. 8 - What is the source of Earth’s magnetic field?Ch. 8 - Why is the shape of the magnetosphere not...Ch. 8 - Although he did not present a mechanism, what were...Ch. 8 - List the possible interactions between Earth’s...Ch. 8 - List, in order of decreasing altitude, the...Ch. 8 - In which atmospheric layer are almost all...
Ch. 8 - What is, by far, the most abundant component of...Ch. 8 - In which domain of living things do you find...Ch. 8 - Describe three ways in which the presence of life...Ch. 8 - Briefly describe the greenhouse effect.Ch. 8 - How do impacts by comets and asteroids influence...Ch. 8 - Why are there so many impact craters on our...Ch. 8 - Detail some of the anthropogenic changes to...Ch. 8 - If you wanted to live where the chances of a...Ch. 8 - Which type of object would likely cause more...Ch. 8 - If all life were destroyed on Earth by a large...Ch. 8 - Why is a decrease in Earth’s ozone harmful to...Ch. 8 - Why are we concerned about the increases in CO2...Ch. 8 - Do you think scientists should make plans to...Ch. 8 - Europe and North America are moving apart by about...Ch. 8 - Over the entire Earth, there are 60,000 km of...Ch. 8 - With the information from Exercise 8.25, you can...Ch. 8 - What is the volume of new oceanic basalt added to...Ch. 8 - Suppose a major impact that produces a mass...Ch. 8 - How do the risks of dying from the impact of an...Ch. 8 - What fraction of Earth’s volume is taken up by the...Ch. 8 - Approximately what percentage of Earth’s radius is...Ch. 8 - What is the drift rate of the Pacific plate over...Ch. 8 - What is the percent increase of atmospheric CO2 in...Ch. 8 - Estimate the mass of the object that formed Meteor...
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Need a deep-dive on the concept behind this application? Look no further. Learn more about this topic, physics and related others by exploring similar questions and additional content below.Similar questions
- With the information from Exercise 8.25, you can calculate the average age of the ocean floor. First, find the total area of the ocean floor (equal to about 60% of the surface area of Earth). Then compare this with the area created (or destroyed) each year. The average lifetime is the ratio of these numbers: the total area of ocean crust compared to the amount created (or destroyed) each year.arrow_forwardWhat is the Mid-Atlantic Ridge?arrow_forwardOver 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_forward
- Explain briefly how the following phenomena happen on Earth, relating your answers to the theory of plate tectonics A. earthquakes B. continental drift C. mountain building D. volcanic eruptions E. creation of the Hawaiian island chainarrow_forwardThe glaciers of Greenland have a total area of approximately 18 × 10^12 ft^2 and an average depth of 1.0 mile. What is the volume of water that would be released if all the glaciers were to melt? Given that oceans cover 70% of planet earth and the earth radius is approximately 6,371 kilometers, how much would ocean levels rise? (Neglect differences in the density between ice and water and changes in ocean coverage upon rising sea levels)arrow_forwardGrinnell Glacier is a glacier within Glacier National Park. In 1850, the area of the Grinnell Glacier was 2,329,918 square miles. By 1950, its mass had dropped to 1,336,855 square miles. How much area has been lost by the glacier between 1850 to 1950, measured in square kilometers?arrow_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_forwardThe Lithosphere is made of the two types of crust, denser oceanic crust and thicker conteniental crust, plus the upper rigid part of the mantle. The Lithosphere float on the semi-liquid Asthenosphere. The Asthenosphere moves through a process known as convection. The convection form currents moving hotter less dense mantle toward the surface where it cools becomes denser and sinks. Another name for the asthenosphere is the ?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
- The 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_forwardWhat happen if the objects' density is greater than, less than or equal to water's (1 gm /cm3)?arrow_forwardThe Richter scale describes how much energy an earthquake releases. With every increase of 1.0 on the scale, 32 times more energy is released. How many times more energy would be released by a quake measuring 2.0 more units on the Richter scale?arrow_forward
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