Name Date P Questions: 1. Name and describe the feature of the ocean floor shown at A. 2. Describe the process shown occurring at \( B \), and explain what results from this. 3. What happens to old oceanic crust as new molten material rises from the mantle? 4. The arrows on the figure show the ocean floor spreading from the ridge. What are three kinds of evidence scientists have found to support this idea? 1. 2. 3. 5. What process is shown occurring at \( C \), and why does it occur? 6. A device that scientists use to map the ocean floor is 7. The feature on the ocean floor at \( \mathrm{C} \) is called a(n) 8. The process that continually adds new material to the ocean floor is called 9. The process by which the ocean floor sinks into the mantle is called 10. A chain of underwater mountains along which sea-floor spreading occurs is a
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Without a specific diagram or figure, it's impossible to accurately describe the feature at A. However, in general, features of the ocean floor can include things like trenches, ridges, or seamounts. Show more…
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Geological Features in analyzing certain gcological features, it is often appropriate to assume that the pressure at some horizontal level of compensation, deep inside Earth, is the same over a large region and is equal to the pressure due to the gravitational force on the overlying material. Thus, the pressure on the level of compensation is given by the fluid pressure formula. This model requires, for one thing, that mountains have roots of continental rock extending into the denser mantle (Fig. $15-36$ ). Consider a mountain $6.0 \mathrm{~km}$ high. The continental rocks have a density of $2.9 \mathrm{~g} / \mathrm{cm}^{3}$, and beneath the continent the mantle has a density of $3.3 \mathrm{~g} / \mathrm{cm}^{3}$. Calculate the depth $D$ of the root. (Hint: Set the pressure at points $a$ and $b$ equal; the depth $y$ of the level of compensation will cancel out.)
The ocean floor is underlain by a layer of basalt that constitutes the crust, or uppermost layer, of the Earth in that region. Below the crust is found denser peridotite rock, which forms the Earth's mantle. The boundary between these two layers is called the Mohorovicic discontinuity ("Moho" for short). If an explosive charge is set off at the surface of the basalt, it generates a seismic wave that is reflected back out at the Moho. If the speed of the wave in basalt is $6.50 \mathrm{~km} / \mathrm{s}$ and the two-way uravel time is $1.85 \mathrm{~s}$, what is the thickness of this oceanic crust?
In analyzing certain geological features, it is often appropriate to assume that the pressure at some horizontal level of compensation, deep inside Earth, is the same over a large region and is equal to the pressure due to the gravitational force on the overlying material. Thus, the pressure on the level of compensation is given by the fluid pressure formula. This model requires, for one thing, that mountains have roots of continental rock extending into the denser mantle (Fig. $14-34$ ). Consider a mountain of height $H=6.0 \mathrm{km}$ on a continent of thickness $T=32 \mathrm{km}$ . The continental rock has a density of $2.9 \mathrm{g} / \mathrm{cm}^{3},$ and beneath this rock the mantle has a density of 3.3 $\mathrm{g} / \mathrm{cm}^{3}$ . Calculate the depth $D$ of the root. (Hint: Set the pressure at points $a$ and $b$ equal; the depth $y$ of the level of compensation will cancel out.)
Umar Sohail Q.
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