Wildfire can be said to ________
A) be a small effect worldwide
B) be mainly limited to desert climates
C) occur only in climax communities
D) be necessary for some plant communities to thrive
E) cause most of the plant diversity in an area
Answer: D
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In addition to glaciers melting and the oceans acidifying, what other indicators are there of climate change?
A. Birds in the northern hemisphere have expanded their ranges northward. B. Birds in the southern hemisphere have expanded their ranges northward. C. Plants have expanded their range down mountain slopes. D. Bees have expanded their range in the direction of the equator.
What country in the region is a cautionary tale about the limits of the ability of a valuable natural resource, such as oil, to promote development?
A) Angola B) Kenya C) Nigeria D) South Africa E) Sudan
Due to the high uncertainty in volcano eruption, geologists cannot provide near-term predictions of volcano eruptions at present, and hence people cannot take precautions.
a. true b. false
Clouds continually are pulled to the ground by gravity. Why do they stay aloft?
A. New cloud droplets continually replace those that fall to Earth's surface. B. Water evaporating from Earth's surface presents an opposing force to the falling cloud droplets. C. Updrafts of air oppose the gravitational force. D. Clouds weigh so little that they fall too slowly to be noticed.