The nucleus of a comet is a block of _____.
A) iron
B) helium
C) ice
D) rock
E) organic material
Correct Answer:
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Q45: _ is the most volcanically active object
Q46: Jupiter, Saturn, Uranus, and Neptune are surrounded
Q47: The surface of Venus is hidden by
Q48: The inner planets are sometimes called the
Q49: Martian winds have created _.
A) polar ice
Q51: The atmosphere of Venus is dominated by
Q52: Biological processes have removed most of the
Q53: _ dominate the topography of lunar highlands.
A)
Q54: The existence of huge channels that look
Q55: The Moon's _ explains why it is
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