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What's shaking on the moon.
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Plate tectonics are what
causes most seismic activity
on the Earth.
The difference between
the Earth and the moon is
that the moon has
no plate tectonics.
You could sort of think
of it as a solid shell.
So the seismic events recorded
on the moon are a bit different
from types that are
recorded on the Earth.
On the Moon we have three main
types of seismic activity.
We have impacts, which
is usually meteorites
that are actually impacting
the surface of the moon.
Another type is shallow
moonquakes.
They're not associated
with plate boundaries,
but on the moon we don't
really know what causes these
and they are relatively rare.
The third type of
event that's recorded
on the moon is called
the deep moonquake,
and these are much more frequent
but they are very small.
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Be sure to tell your teacher
to visit the NASA Explorer
Schools Virtual Campus.
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