Desert ecosystems are fragile for which of the following two reasons?
A. frequent wildfire and flooding
B. rapid nutrient cycling and frost damage
C. slow plant growth and low species diversity
D. overpopulation of predator species and drought
E. off-road vehicle traffic and deep, organic soils
Answer: C
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In what year did world oil prices peak at $140 per barrel?
A) 1968 B) 1978 C) 1988 D) 1998 E) 2008
The thickness of Earth's crust ranges from
A) 70 km to 250 km (43 mi. to 155 mi.). B) barely 1 km to 2900 km (0.62 mi. to 1800 mi.). C) the surface to an unknown depth. D) 7 km to 250 km (4 mi. to 155 mi.). E) 5 km to 60 km (3 mi. to 37 mi.).
What factors account for the expanded size of both the population and the economy in the Rocky Mountain region during the past two decades?
What will be an ideal response?
Other than ice sheets and glaciers, the largest repository of fresh water is located in
A) soil moisture storage. B) lakes and saline seas. C) rivers and streams. D) groundwater. E) atmospheric water vapor.