How much of the Earth's atmosphere lies below 32 km altitude?

A. 89 percent
B. 99 percent
C. 59 percent


Answer: B

Environmental & Atmospheric Sciences

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Researchers have drilled all the way to the mantle

a. True b. False

Environmental & Atmospheric Sciences

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

Environmental & Atmospheric Sciences

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

Environmental & Atmospheric Sciences

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

Environmental & Atmospheric Sciences