Earth's atmosphere is able to gradually refract light rays:
A) only when it is very dry.
B) only when the sun is very high in the sky.
C) because of the changing density of air as you get closer to the surface.
D) because of air pollution that is present.
C
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What type of biome plays a critical role in the hydrologic cycle by storing ice and snow and covers about one-fourth of the earth's land surface?
A. forests B. mountains C. desert D. grasslands E. tundra
If a national leader, in her speech to the nation, is talking about meeting the needs of our present populations without risking the ability of future generations to meet their needs, she is describing
A. Sustainable development B. A free market-based philosophy of economic development C. Ecodevelopment D. Green design E. An economic-based approach to development
Dew is likely to form at the end of a clear, calm night
Indicate whether the statement is true or false
Which two terms can refer to the same plate boundary?
A) terrane, trench B) divergent, constructive C) convergent, constructive D) divergent, destructive E) subduction, constructive