What is the role of the ozone layer?
A. It reflects heat to the surface.
B. It creates a warm blanket around the Earth.
C. It protects the surface from ultraviolet radiation from the Sun.
D. It blocks all electromagnetic radiation from space.
Answer: C
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_________________________. Fill in the blank(s) with the appropriate word(s).
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Given that a region has an average annual air temperature of 13°C, what would the subsurface temperature be at a depth of 2 km? Assume the geothermal gradient is the same as the world average geothermal gradient, which is approximately 30°C per kilometer.
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