Earth's Internal Forces/Plate Tectonics Exam

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• 2
• 3
• 4

1. Which of the following is true about the Earth's crust?

• A. The surface of continental crust is found at higher elevations than the surface of oceanic crust.
• B. The surfaces of continental and oceanic crust do not follow any elevation pattern.
• C. The surfaces of continental and oceanic crust are usually found at the same elevation.
• D. The surface of oceanic crust is found at higher elevations than the surface of continental crust.

2. Tectonic plates move at rates of?

• A. hundreds of meters per year.
• B. kilometers per year.
• C. meters per year.
• D. centimeters per year.

3. New oceanic crust is continually forming on Earth. Where does most of this crust form?

• A. in subduction zones
• B. at continental collision zones
• C. at hotspots
• D. at mid ocean ridges.

4. Four locations are labeled on the diagram. Which location has the youngest rock material?

• A. X
• B. Z
• C. W
• D. Y

5. Scientists study the decay of radioactive isotopes in a material in order to determine

• A. only the relative age of the material.
• B. the thickness of the rock layer containing the material.
• C. the porosity of the rock layer containing the material.
• D. the absolute age of the material.

6. Which statement best explains why different parts of the ocean crust have different ages?

• A. The continents continually move toward the mid-ocean ridge.
• B. Ocean currents carry sediments away from the coastlines.
• C. New crust is constantly being formed at the mid-ocean ridge.
• D. Wave motion near the continents steadily erodes the coastlines.