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Earth's moon is no longer actively volcanic;
today, it is a huge rock orbiting the Earth. The moon's two main features,
the highlands and the maria, are products of flood basalt volcanism. The
highlands are much older, as evidenced by the impact craters covering them.
They separated out from the main lava body and formed the highlands
from the less dense material. The maria are younger and show fewer,
less overlapping craters. The Moon also displays wrinkle ridges, long
low ridges in the maria, and sinuous rilles, long meandering channels. The
moon shows no active volcanism, but in the far past it was molten.
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