How much of the Earth's atmosphere lies below 32 km altitude?
A. 89 percent
B. 99 percent
C. 59 percent
Answer: B
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Of the following, which has the greatest total volume of water?
A) The atmosphere B) Groundwater C) Ice caps and glaciers D) Rivers and lakes
This diagram shows magnetic stripes on either side of the midocean ridge. How many different ages of stripes are represented in this diagram?
A) Two
B) Three
C) Four
D) Six
E) Eleven
Researchers have drilled all the way to the mantle
a. True b. False
Pesticide resistance occurs when a population of pests
A. Is not affected by chemicals because the pesticide chemicals do not break down in the environment B. Genetically changes (through natural selection) and is no longer affected by the chemicals C. Grows extremely large because of chemical misapplications D. Is completely wiped out by the pesticide chemicals E. Becomes too numerous for chemicals to control