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The word "it" in line 21 refers to
A. formation
B. ice
C. thickness
D. weight
It can be inferred from the last paragraph that a glacier
A. can revert to a fluffy mass
B. maintains the same shape through out the glacial process
C. is too cold to be thoroughly studied
D. can contribute water to lakes, rivers, or oceans
According to the passage, which of the following is the LEAST amount of time necessary for
A. Several months
B. Several years
C. At least fifty years
D. A century
It can be inferred from the passage that one main difference between termites and ants is
A. live above ground
B. are eusocial
C. protect their nests
D. eat almost no animal substances
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