Which of the following did not contribute to the collapse of agricultural ecosystems during the Dust Bowl?
A) shelterbelt planting
B) lack of cover crops
C) drought conditions
D) burning of fields
E) plowing practices
Answer: A
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When did the Himalayan Mountains form?
A) Cenozoic Era B) Paleozoic Era C) Mesozoic Era D) Devonian Period
Relative humidity is a measure of ________.
a. how much water vapor is in the air b. the ratio of water vapor in air to the amount of air c. the amount of water vapor in the air compared to some standard amount of water vapor d. the ratio of the water vapor in the air to the amount of water vapor that it would take to saturate the air e.None of these
The rock pumice often floats yet the density of the rock is greater than water. Why does it float?
A) Pumice is a pyroclastic rock derived from rhyolite glass, and rhyolite glass has a lower density than water. B) Pumice is a pyroclastic rock comprised largely of open voids formed by gases released when the magma solidified as froth-like material. C) Pumice is another name for dacite, a low-density rock that floats in water. D) Pumice is a rock made of rhyolite glass that erupts into water, which traps water in voids and makes the material less dense than water.
Biomagnification can directly cause
A) increases in the amount of energy to be available in the ecosystem. B) rapid population explosions when environmental conditions provide an opportunity for growth. C) a temporary speedup of nutrient cycling in an ecosystem. D) higher-level heterotrophs to be more susceptible to poison than lower-level heterotrophs.