What type of weathering agents are lichen considered?
A. mechanical
B. chemical
C. oxidation
D. hydrolysis
E. biological
E
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With the exception of water vapor, ______ is the most plentiful of the variable gases in the atmosphere.
A - carbon dioxide B - ozone C - carbon monoxide D - argon E - sulfur dioxide
How much of the world's water is freshwater?
a. 30% b. 20% c. 10% d. 5% e. less than 3%
At the periphery of a hurricane, the air is ____
A) sinking and warming B) sinking and cooling C) rising and warming D) rising and cooling
In July, the thermal equator
A) trends equatorward over continents and poleward over the oceans. B) assumes an orientation that closely parallels that of the equator. C) trends poleward over continents and equatorward over the oceans. D) is apparently random and has yet to be adequately explained.