Diatoms flourished during the Miocene, likely because increased volcanism meant oceans were enriched in the
element ____________________, which diatoms use to build their skeletons. Fill in the blank(s) with the appropriate word(s).
silica
silicon
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Why do you think the freshwater in the ice sheets is generally considered
unavailable for human use? What will be an ideal response?
Which of the following is true?
A) Lightning results from the buildup of electrical-energy polarity within clouds. B) Thunder is caused by rapid cooling of the air. C) Thunder is caused by rapid contraction of the air. D) Lightning is relatively uncommon on the Earth.
Thunderstorms that form on the windward sides of mountains are classified as:
a. convective. b. frontal. c. cyclonic. d. orographic
Undernourished parents often raise children who are undernourished because the parents
A. Do not have access to the information about nutrition. B. Cannot afford to feed their children properly. C. Transfer genetic deficiencies to their children. D. Do not know any better. E. All of these are reasons for the vicious cycle.