The level of ____ increases with depth which is a factor in the calcium carbonate compensation depth
a. Nitrogen
b. Oxygen
c. Carbon Dioxide
d. Ammonia
ANS: C
Carbon dioxide concentrations are higher at deeper depths. Contrastingly, oxygen levels decrease as
the depth decreases. This is true until middle depths of the ocean; then, oxygen levels begin to increase
again. Information can be found in the section Gases Dissolve in Seawater.
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A keystone species is an organism that ________.
A. lives in coastal regions B. is very abundant C. plays a crucial role in an ecosystem D. is endangered
Arêtes, horns, and hanging valleys are evidence of ________ glaciation
A) alpine B) ice shelf C) continental D) ice cap
Wind travels from areas of low pressure to areas of high pressure
Indicate whether the statement is true or false
"Rain long foretold, long last; short notice, soon past." The first five words of this weather proverb ________
A) refer to an anticyclone B) refer to a cold front C) refer to a warm front D) have no basis in fact