What condition is most necessary to build a glacier?
A) The temperature must be cold enough to cause snow to fall regularly.
B) The snow must be able to move downhill slowly.
C) The elevation of the area must be high enough to allow snow to fall regularly.
D) More snow must fall in the winter than melts in the summer.
D
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The event horizon of a black hole is
A. the point in time when a black hole comes into being. B. the physical surface of the black hole. C. the surface below which no matter or energy can escape. D. the surface where light becomes trapped in a circular orbit around the black hole.
An action potential travels more quickly down an axon if the axon is
A) longer. B) thinner. C) thicker. D) not myelinated.
Which of the following best describes renewable energy resources?
A) They currently supply 20% of the Earth's electricity. B) They contribute only 70% as much greenhouse gases as fossil fuels do. C) They have been largely ignored by the Obama administration. D) They are unsuitable for the economies of developing nations.
Although major shipping accidents are spectacular and release large amounts of oil, it is estimated that worldwide only about 10% of human-caused oil pollution comes from tanker accidents.
Answer the following statement true (T) or false (F)