When the separation distance between a pair of stars becomes half their usual distance the force between them
A. decreases to one-half.
B. decreases to one-quarter.
C. increases to four times as much.
D. increases to twice as much.
Answer: C
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The convex upper portion of a typical slope is called a
A) pediment. B) debris slope. C) waxing slope. D) free face.
Sinkholes can result from ________
A) building on floodplains B) flood damage and chemical erosion C) substrates that become weak following rain D) poorly drilled wells in soft soils E) overconsumption of water from aquifers
Where was the term smog first used, and why?
The ecological economic paradigm argues that the environment encompasses the economy because the environment is essential to provide
A) the energy necessary to run our homes and factories. B) solar energy needed for plants and to light our environment during the day. C) transportation along highways, railways, rivers, and oceans. D) vital raw materials and ecosystem services and absorb wastes.