What percentage of the Earth's surface does ice presently cover?
A. less than 1%
B. about 5%%
C. about 66%
D. about 10%
Answer: D
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What are three adaptation steps that could be taken to anticipate inevitable changes in climate?
What will be an ideal response?
Salt crystal growth causes weathering because ____
a. chemical reactions with salt weaken some minerals b. organisms readily grow on salt crystals c. salt oxidizes readily d. salt expands when it freezes e. growing salt crystals can wedge apart cracks
Several older dams across North America are scheduled for decommissioning (major modification or removal) due to environmental concerns
Indicate whether the statement is true or false
Other than the rock itself, the most important chemical substance needed for the majority of weathering processes is
A) nitrogen. B) carbon dioxide. C) oxygen. D) water.