The Interior of the Moon

Crust about 60 kms. Deep, although thinner on the near side.

Mantle about 1000 kms.

Core about 700 kms. If the core is very small, then it occupies a significantly smaller fraction by volume than the core of any other terrestial planet.

Magnetic Field

The seismographs set up by the Apollo astronauts record 1,300 moonquakes per year.