GIMME SOME MOON FACTS from ASTR 20....

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GIMME SOME MOON FACTS

Back (Answer)

heavily cratered, no atmosphere,
geologically inactive

The Moon once had a molten interior.

Several large impacts made huge crater basins.
left cracks in lithosphere below
at a later time, molten basalt leaked through the cracks

This "runny" lava filled in the basins.

highlands
older surface
more craters

mare
younger surface

3 - 4 billion yrs
fewer craters
dark basalt

Since moon has to substantial atmosphere, fast particples and high-energy photons reach its surface

bombardment careats a rarified exosphere

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