The ideal texture for a soil to minimize the risk of pollution is one that
A) is very coarse, so that it drains efficiently.
B) is very fine, so that it minimizes the contamination to groundwater.
C) is very fine, so that it improves the ability to dissolve hazardous materials.
D) is of moderate sized particles, to reduce ponding while still having some filtering capabilities.
D) is of moderate sized particles, to reduce ponding while still having some filtering capabilities.
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Compared to microtechnology, nanotechnology focuses on a scale that is about
A. 10 times smaller. B. 1000 times smaller. C. 100 times smaller. D. a million times smaller.
The presence of talus is a good sign that _____ is occurring
a. solifluction b. slump c. rockfall d. creep e. flow
Services generate more than two-thirds of GDP in most ________, compared to less than half in most ________
A) developed countries; developing countries B) urban areas; rural areas C) developing countries; developed countries D) rural areas; urban areas E) Central Asian countries; Latin American countries
Thrusting a bar magnet at the same speed into a coil having twice the number of loops, the induced voltage is
A. half. B. the same, no different. C. four times as much. D. twice as much.