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The theory for the Moon’s formation thought to be most likely is _____. There is some evidence that the Earth originally had _____.

Mercury is similar in size to many of the moons in the solar system. However, Mercury’s _____ is much _____ than that of the moons.

The fact that Jupiter’s moon Ganymede has a magnetic field is surprising because _____.

Planetary rings occur _____. Some small moons of Saturn are able to exist in the same region as the rings because _____.

Planetary rings occur _____. Some small moons of Saturn are able to exist in the same region as the rings because _____.

Jupiter emits about twice as much energy per second as it receives from the Sun, probably because of _____. Saturn emits about three times as much energy per second as it receives from the Sun, probably because of _____.

Jupiter emits about twice as much energy per second as it receives from the Sun, probably because of _____. Saturn emits about three times as much energy per second as it receives from the Sun, probably because of _____.

Final Reflection

Platelets are fragments of large bone marrow cells called and help stop bleeding through the process of .

The flaplike covers the glottis during swallowing to prevent food from entering the .