21st Century Astronomy
6th Edition
ISBN: 9780393428063
Author: Kay
Publisher: NORTON
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Chapter 8, Problem 43QP
To determine
The time were the continents joined as part of a super continent.
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Students have asked these similar questions
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?
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.)
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.
Chapter 8 Solutions
21st Century Astronomy
Ch. 8.1 - Prob. 8.1CYUCh. 8.2 - Prob. 8.2CYUCh. 8.3 - Prob. 8.3ACYUCh. 8.3 - Prob. 8.3BCYUCh. 8.4 - Prob. 8.4CYUCh. 8.5 - Prob. 8.5CYUCh. 8.6 - Prob. 8.6CYUCh. 8 - Prob. 1QPCh. 8 - Prob. 2QPCh. 8 - Prob. 3QP
Ch. 8 - Prob. 4QPCh. 8 - Prob. 5QPCh. 8 - Prob. 6QPCh. 8 - Prob. 7QPCh. 8 - Prob. 8QPCh. 8 - Prob. 9QPCh. 8 - Prob. 10QPCh. 8 - Prob. 11QPCh. 8 - Prob. 12QPCh. 8 - Prob. 13QPCh. 8 - Prob. 14QPCh. 8 - Prob. 15QPCh. 8 - Prob. 16QPCh. 8 - Prob. 17QPCh. 8 - Prob. 18QPCh. 8 - Prob. 19QPCh. 8 - Prob. 20QPCh. 8 - Prob. 21QPCh. 8 - Prob. 22QPCh. 8 - Prob. 23QPCh. 8 - Prob. 24QPCh. 8 - Prob. 25QPCh. 8 - Prob. 26QPCh. 8 - Prob. 27QPCh. 8 - Prob. 28QPCh. 8 - Prob. 29QPCh. 8 - Prob. 30QPCh. 8 - Prob. 31QPCh. 8 - Prob. 32QPCh. 8 - Prob. 33QPCh. 8 - Prob. 34QPCh. 8 - Prob. 35QPCh. 8 - Prob. 36QPCh. 8 - Prob. 37QPCh. 8 - Prob. 38QPCh. 8 - Prob. 39QPCh. 8 - Prob. 40QPCh. 8 - Prob. 41QPCh. 8 - Prob. 42QPCh. 8 - Prob. 43QPCh. 8 - Prob. 44QPCh. 8 - Prob. 45QP
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- The 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_forwardEurope 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_forwardExplain 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_forward
- 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_forwardWhich is the most geologically active Terrestrial world? Why?arrow_forwardWhich of the five Terrestrial worlds have bow shocks, magneto-spheres, and radiation belts? How do you know?arrow_forward
- What 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_forwardTwo plates are diverging and both are moving at a rate of 3 centimeters per year. How long will it take for them to move 100 kilometers apart?arrow_forward
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