A stream erodes material from its banks and bed by:
a. suspension.
b. hydraulic action.
c. abrasion.
d. suspension and hydraulic action.
e. hydraulic action and abrasion.
E
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When a tropical rain forest is clear-cut, the most likely impact to the environment is
A) loss of biodiversity. B) movement of oxygen from the biosphere into the atmosphere. C) increase in water stored in soils. D) a decrease in the number of days with freezing temperatures.
Only about 2.5% of all the water on our planet is fresh water, and ________
A) most of this is far from where humans live B) over half of this is in wetlands near coastlines and is becoming contaminated with saltwater C) over half of this is extremely hard water and is nearly unusable for drinking or agriculture D) most of this is in underground aquifers E) most of this is in large, freshwater lakes
At Lake Nyos in 1986, a gas cloud wiped out all nearby plant and animal life.
Answer the following statement true (T) or false (F)
What occurs during the final stage, the post-industrial stage, of the demographic transition model?
a. The birth rate and the death rate are high. b. The birth rate slowly decreases and the death rate decreases. c. The population size rapidly increases. d. Both the birth rate and the death rate continue along at very low levels.