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Which surface is the oldest in this photograph of the Moon?

On this photo of the Moon, select the answer that corresponds to one of the maria.

The T-Tauri phase of a star’s history ________.

Study this thermal evolution diagram, which shows how the interior of a terrestrial planet should change with time and temperature. Select the part of the image that corresponds to the crust.

Study this thermal evolution diagram, which shows how the interior of a terrestrial planet should change with time and temperature. Select the part of the image that corresponds to the magma ocean.

What process formed these sinuous valleys?

Important sources of planetary heat include all of the following except ________.

If you were a solar system explorer in search of liquid water at or near the surface, where in Jupiter’s satellite system would you look?

The spin axes of some planets are tilted relative to the plane in which most orbit. What could have caused this?

Most meteorites which fall to Earth are of which type?