What percentage of marine pollutants originates from human activities on land?
a. 25%
b. 50%
c. 75%
d. 90%
ANS: C
A pollutant causes damage by interfering with biological processes of an organism. There are various
rates a pollutant can impact an organism. Information can be found in the section Marine Pollutants
May Be Natural or Human Generated.
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Polar stratospheric clouds
A) absorb chlorine from atmospheric compounds. B) are warmer than most tropospheric clouds. C) are present only when the ozone hole is present. D) consist only of water vapor. E) are present year-round.
As of 2015, what is the approximate CO2 level in Earth’s atmosphere?
a. ?100 ppm b. ?200 ppm c. ?400 ppm d. ?800 ppm e. ?1200 ppm
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What will be an ideal response?