There has only been one Ice Age.
a. true
b. false
b. false
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Tropical storms and associated floods have greater impacts in poor countries that have experienced ________
A) deforestation B) hurricanes C) soil erosion D) desertification E) forest fires
The usual size of an air mass is:
A) around 1000 km across. B) at least 1600 km across. C) at most a few kilometers across. D) between 100 and 200 km across.
Along ________ new ocean floor is formed by upwelling flows of magma, whereas along ________ old oceanic crust is destroyed
A) oceanic trenches; archipelagos B) subduction zones; mid-ocean ridges C) archipelagos; oceanic trenches D) mid-ocean ridges; subduction zones
Most public rangelands are in poor condition due to
A. Overcrowding of private livestock B. Excessive populations of wild ungulates C. Too many publicly-owned animals on public lands D. The lack of water E. Excessive urban settlement in the west