Ozone depletion is caused by ____.
A. chlorofluorocarbons (CFCs) in the troposphere
B. chlorofluorocarbons (CFCs) in the stratosphere
C. global warming
D. the greenhouse effect
E. cold air in the polar regions
Answer: B
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Would you expect polypropylene to be denser or less dense than low-density polyethylene? Why?
A. Polypropylene should be more dense given that the polyethylene is already known to be of low density. B. Polypropylene should be less dense because its molecules are not able to pack together as tightly. C. Polypropylene should be more dense because it has a greater molecular mass. D. Polypropylene should be more dense because its molecules are able to pack more closely together.
This Southeast Asian country still produces a large proportion of the world's rubber crop
A. Indonesia B. Philippines C. Malaysia D. Thailand
A lahar may form when ____
A)lava is cooled quickly underwater B)volcanic gas is erupted into the stratosphere C)lava cools and cracks along joints D)magma moves through fissures in the country rock E)rain falls on unconsolidated pyroclastic materials
In the mature stage of an ordinary single-cell thunderstorm
A) lightning is most likely to occur. B) the updrafts weaken substantially. C) precipitation is light to moderate. D) cloud droplets shrink and evaporate. E) none of the above