How long does it take for many plastics to decompose?
a. 50 years
b. 100 years
c. 250 years
d. 400 years
ANS: D
There are advantages of using plastics. They are durable and stable. Unfortunately, these advantages
also make them difficult to decompose in marine environments. Information can be found in the
section Marine Pollutants May Be Natural or Human Generated.
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The hierarchical (also known as cascade) diffusion pattern by which HIV/AIDS spread across the world is characterized by moving across the world's
A) lowest income countries. B) major urban areas. C) most popular tourist areas. D) island countries. E) tropical regions.
Which of the following terms refers to clouds that appear as bag-like sacks hanging from beneath other clouds?
A. pileus B. mammatus C. castellanus D. lenticular
What is the greatest contributing factor in the loss of polar bears in arctic areas?
A) decline in sea ice B) the tundra shifting northward C) fires in the taiga and tundra D) the decline of lemmings; the primary food of the polar bear E) hunting of the polar bear by the Inuit people
Which of the following statements is true?
A) In light atoms there are generally many more protons than neutrons. B) In light atoms there are generally many more neutrons than protons. C) In light atoms the number of protons and neutrons are nearly equal. D) Most naturally occurring isotopes of light atoms are radioactive.