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Mercury, the closest planet to the sun,
is a small planet. Since it is so close to the sun, it is rather hard
to study. This leads to some rather indeterminate conclusions. There
are many features on Mercury which suggest volcanism, although there is
controversy as to how definitive these features are. There are domes,
cones, and shield volcanoes. The craters on Mercury help determine
the existence of volcanism. It is because they are of such similar
size, and separated by basically featureless plains. These could have
been produced by volcanic resurfacing. Currently, Mercury is volcanically
extinct.
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