Why is sand so important in the desert environment?
What will be an ideal response?
Answer: Sand is the desert material that allows rapid infiltration of rainwater, is readily moved by heavy rains, and can be shifted and shaped by the winds. It is so plentiful because it is the usually smallest weathering size produced by mechanical weathering that dominates arid areas. Importantly, most of the world's desert surface is not covered with great depths of sand.
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All of the following are features of greenstone belts except
a. volcanic and sedimentary rocks. d. complex folding and faulting. b. key index fossil assemblages. e. pillow lava. c. granitic intrusions.
Which toxic gas is an important component in London-type smog?
A) ozone (O3 ) B) sulfur dioxide (SO2 ) C) radon (Rn) D) carbon monoxide (CO)
The Kyoto Protocol ________
A) was intended to reduce emissions of six greenhouse gases to levels lower than those of 1990 B) required increases in nuclear power generation C) required equal concessions from all countries involved in greenhouse gas emission D) increased federal funding for controlling greenhouse gas emissions from U.S. power plants E) would have resulted in overall increases in greenhouse emissions
The measure of a soil's capacity to hold water and air is called ________
A) porosity B) permeability C) peds D) its profile E) foaminess