Volcanic eruptions can affect the climate because
A. volcanic dust and gas can reduce the amount of solar radiation that penetrates the atmosphere
B. they heat the atmosphere
C. they change the elevation of the land
D. all of the preceding
Answer: A
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We can say that Earth's crust floats on the mantle because
A) the mantle is very hot and flows from internal convection. B) part of the mantle is hot enough to flow as a plastic solid. C) the continental crust floats on the oceanic crust. D) the mantle is below the crust.
Which of the following is correct regarding permafrost?
A) It develops where soil or rock temperatures are below freezing for at least two years. B) It primarily occurs in areas covered with glaciers. C) The surface layer of permafrost never thaws, even in the warm season. D) It tends to occur at lower elevations in the midlatitudes than in the high latitudes.
From a chemical standpoint, the three reacting agents of greatest importance to weathering are ________
A) hydrogen, oxygen, and nitrogen B) oxygen, nitrogen, and carbon dioxide C) carbon dioxide, oxygen, and water D) water vapor, nitrogen, and carbon dioxide E) argon, aluminum, and calcium
Heating ores to release the metals they contain is called ____________________
Fill in the blanks with correct word