A biogeophysical feedback mechanism in the Sahel relates:a
reduced cloud cover to increasing surface temperatures and an increase in rainfall
b. reduced vegetation to a decrease in surface temperatures and a reduction in rainfall
c. an increase in vegetation to an increase in surface temperatures and a reduction in rainfall
d. a decrease in vegetation to a lowering of surface albedo and an increase in rainfall
b
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Which of the following best describes the role of autotrophic (self-feeding) organisms in ecosystems?
A) They produce their own organic molecules, which can be broken down for energy. B)They consume other organisms for energy. C) Without heterotrophs, there would be no autotrophs. D) They produce their own inorganic molecules, which can be broken down for energy.
The Navajo Sandstone, such as that exposed at Zion National Park in Utah, is evidence of a ________ environment during the Jurassic Period in the western United States
A) beach B) continental shelf C) lacustrine D) desert
The use of what energy resource is a major contributor to acid rain?
A) coal B) geothermal power C) hydropower D) natural gas E) nuclear power
Shield volcanoes are produced from which type of magma?
A. Andesite B. Rhyolite C. Basalt D. All of these choices are correct