When the universe originated, it was composed of 100% ____________________ and
____________________, but now consists of ____________________% hydrogen and 2%
____________________ elements. Fill in the blank(s) with the appropriate word(s).
hydrogen, helium, 98, other
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Phytoplankton is responsible for the synthesis of 90% to 96% of the surface ocean's carbohydrates. Indicate whether the statement is true or false
A hurricane is almost symmetric (round) in shape because
A) there is no Coriolis force in the tropics. B) there is no frictional force in the tropics. C) a hurricane has only warm air. D) the hurricane moves along the ITCZ.
What region of the United States draws most of its electricity from nuclear power plants?
A) Middle West B) New England C) South D) West (excluding Alaska and Hawaii) E) Alaska and Hawaii
A central peak, or a dome of a volcanic mountain, generally produces ________ drainage patterns.
a. annular b. trellis c. parallel d. radial