The predominant greenhouse gas produced by human use of fossil fuels is __________.
Fill in the blank(s) with the appropriate word(s).
Answer: carbon dioxide
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Daisy's average speed when running a distance of 2 km in one-half hour is
A. 1 km/h. B. more than 4 km/h. C. 2 km/h. D. 4 km/h.
A delta forms when
A) ocean waves, especially during storms, pile up sediment along the coast. B) a steep mountain front collapses sending sediment out into the sea. C) a river slows and deposits sediment as it enters a lake or sea. D) windblown dust slides down steep hillsides and into a lake.
What is the main difficulty in trying to eliminate chlorinated fluorocarbons from the atmosphere?
A) They are very stable and take a long time to decompose completely. B) They are too light and blow away. C) They do not absorb ultraviolet radiation. D) all of the above E) only A and B
Which of the following changes in conditions indicates heating of the rock?
A. from D to A B. from A to B C. from B to C D. from C to D E. None of these choices are correct.