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# Earth's Deep Layers Practice Questions

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Updated on Sep 25, 2011

Review the following concepts:Earth's Deep Layers

## Practice Questions

1. If the core is 2,880 kilometers below Earth's surface, and Earth's radius is 6,370 kilometers, then what is the diameter of the core?

2. Which of the following is important in establishing the direction of Earth's magnetic field?

a. the earth's rotation

b. the sun

c. the earth's elliptical orbit

d. the orbit of the moon

3. What is true about the core?

a. The inner layer is solid, and the outer layer is liquid.

b. The outer layer is solid, and the inner layer is liquid.

c. The outer layer is gaseous, the middle layer is liquid, and the inner layer is solid.

d. The outer layer is solid, the middle layer is liquid, and the inner layer is gaseous.

4. Where do the lines of force of the magnetic field of the earth emerge from the surface?

a. at a point on the equator

b. at a point near 0° latitude

c. at a point on 0° longitude

d. at a point near the North Pole

5. The different properties of the layers of Earth's core are related to what general fact?

a. Releasing pressure from a solid raises its solidifying temperature.

b. Compressing a liquid raises its solidifying temperature.

c. Climbing a mountain requires energy.

d. Hard-boiling eggs on a mountain requires less time than at sea level.

6. Which is true as we go from Earth's surface downward toward the center?

a. Temperature increases, and pressure decreases.

b. Density increases, and pressure increases.

c. Temperature increases, and density decreases.

d. Pressure increases, and temperature decreases.

7. Which crust is usually thickest?

a. asthenosphere crust

b. continental crust

c. mantle crust

d. oceanic crust

8. Which layer of Earth is "plastic," meaning it behaves like silly putty over long time periods?

a. mantle

b. lithosphere

c. asthenosphere

d. crust

9. Which layer is about 100 kilometers (60 miles) thick?

a. lithosphere

b. oceanic crust

c. mantle

d. upper core

10. Rock reaches a temperature of about 1,300° C at a depth of 100 kilometers below the surface. We can therefore compute a heat gradient, which is the average change in temperature per kilometer of depth. What is the heat gradient in the upper 100 kilometers of Earth?

a. 130,000° C

b. 1.3° C per kilometer

c. 13° C per kilometer

d. 1,200° C

11.  The waves from earthquakes that travel through rock are called what?

a.  lithosphere waves

b.  seismic waves

c.  subterranean waves

d.  shear waves

12. The knowledge that the earth's core has a liquid layer comes from analyzing earthquake waves on the side of the earth opposite to the point that generated the earthquake. What is the key piece of evidence?

a.  the absence of S waves

b.  the absence of P waves

c.  the presence of S waves

d.  the presence of P waves

13.  At a recording station some distance from the epicenter of an earthquake, which are the first waves to arrive?

a.  S waves

b.  seismic waves

c.  asthenosphere waves

d.  P waves

14. We know that Earth's core is iron because of the density required to balance the other layers known density and the known density of the entire earth. Compared to the rocks at Earth's surface, the density of the rock of the core is approximately how much larger?

a.  2 times

b.  1.3 times

c.  4 times

d.  2.5 times

15.  Sound waves in air are most similar to what kind of waves in the earth?

a.  S waves

b.  seismic waves

c.  velocity waves

d.  P waves

2.  a.  the earth's rotation

3.  a.  The inner layer is solid, and the outer layer is liquid.

4.  d.  at a point near the North Pole

5.  b.  Compressing a liquid raises its solidifying temperature.

6.  b.  Density increases, and pressure increases.

7.  b.  continental crust

8.  c.  asthenosphere

9.  a.  lithosphere

10.  c.  13° C per kilometer

11.  b.  seismic waves

12.  a.  the absence of S waves

13.  d.  P waves

14.  c.  4 times

15.  d.  P waves

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