Author: Anonymous

Mercury has an unusually large core.

__________ are great wrinkle marks on Mercury’s crust, due to its core contracting.

One source of the energy for volcanism and plate tectonics is radioactivity in the Earth’s interior.

Unlike our Moon and Mars, all the impact craters found on Venus are _________ in size.

The most important greenhouse effect gas in our atmosphere is __________ .

Jupiter is largest and brightest in our skies when seen at __________ .

Jupiter’s magnetic field is much stronger than Earth’s, and has a magnetic tail that extends beyond the orbit of Saturn.

The Moon’s lower density indicates it has a smaller concentration of iron in its core, as does the absence of a lunar magnetic field.

Carbon dioxide is the predominant atmospheric gas on Venus.

Jupiter gives back into space twice the heat it gets from the Sun; the source of most of this energy is __________ .