Horizons: Exploring the Universe (MindTap Course List)
14th Edition
ISBN: 9781305960961
Author: Michael A. Seeds, Dana Backman
Publisher: Cengage Learning
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Chapter 16, Problem 3P
To determine
The time required to spread the Atlantic seafloor by 6400 km.
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If the Atlantic sea floor is spreading at 3.0 cm/yr and is now 6400 km wide, how long ago were the continents in contact? How does that time span compare to the age of the Earth?
If the Atlantic seafloor is spreading at 2.9 cm/year and is now 6,350 km wide, how long ago (in years) were the continents in contact?
.......yr
How does that time span compare to the age of Earth? (Enter your answer as a fraction of Earth's age.)
A 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.)
Chapter 16 Solutions
Horizons: Exploring the Universe (MindTap Course List)
Ch. 16 - Why would you include the Moon in a comparison of...Ch. 16 - In what ways is Earth unique among the Terrestrial...Ch. 16 - What are the four stages of planetary development?Ch. 16 - How do you know that Earth differentiated?Ch. 16 - How are earthquakes in Hawaii different from those...Ch. 16 - Prob. 6RQCh. 16 - How do island chains located in the centers of...Ch. 16 - Prob. 8RQCh. 16 - H does the increasing abundance of CO2 in Earth’s...Ch. 16 - Why would a decrease in the density of the ozone...
Ch. 16 - Prob. 11RQCh. 16 - Prob. 12RQCh. 16 - Prob. 13RQCh. 16 - How Do We Know? Why is heat flow the key to...Ch. 16 - How Do We Know? In what ways have scientists been...Ch. 16 - Prob. 1DQCh. 16 - Prob. 2DQCh. 16 - Assume P waves travel at 10 km/s and S waves...Ch. 16 - Earth’s metallic core has about 55% of the...Ch. 16 - Prob. 3PCh. 16 - Prob. 4PCh. 16 - Prob. 5PCh. 16 - Earth is four times lager in diameter than its...Ch. 16 - The smallest detail visible through Earth-based...Ch. 16 - Prob. 1LTLCh. 16 - Prob. 2LTLCh. 16 - Prob. 3LTLCh. 16 - Prob. 4LTLCh. 16 - Prob. 5LTL
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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
- 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 1km=1000m .)arrow_forwardWhich is the most geologically active Terrestrial world? Why?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_forward
- 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 35 km thick (the average thickness of the Earth's crust), estimate the height (in km) of the continent above the surrounding mantle. Continent (density = 2800 kg/m3) mg Mantle rock (density = 3300 kg/m³) 5.3. 7.4. 9.8 12. 17.arrow_forwardIf 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) Following an earthquake, how long would it take a P-wave, moving in a straight linewith a speed of 5 km/s, to reach Earth’s opposite side? b) At 3 cm/yr, how long would ittake a typical plate to traverse the present width of the Atlantic Ocean, about 6000 km?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 Hawaiian-Emperor chain of undersea volcanoes is about 7500 km long, and the Pacific plate is moving 9.2 cm a year. How old is the oldest detectable volcano in the chain? What has happened to older volcanoes in the chain?arrow_forwardWhich of the five Terrestrial worlds have plate tectonics? How do you know?arrow_forward
- How do island chains located in the centers of tectonic plates, such as the Hawaiian-Emperor chain, indicate ongoing plate tectonic activity?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_forwardWhat is the Mid-Atlantic Ridge?arrow_forward
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