The sun does because it's light reflects off the moon. The more light reflected the bigger the shape. The less light reflected, the smaller the shape.
Sedimentary
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ethurystred
Its the same reason as to why every other heavenly body is spherical in shape. its because any rotating body in order to conserve energy takes the shape involving least tension and hence your planets, moons are spherical in shape.
It has two moons, it's reddish appearance is a result of the large amounts of iron oxide (aka rust).
No they are not
Mars' moons are much smaller than, for example, Earth's Moon, or the larger moons of Jupiter. A large moon will have a larger gravity, which will tend to pull the moon together into a spherical shape.
It have two moons
Your question makes no sense.
The Earth's and Moon's rotation.
No. Jupiter's smaller moons are irregular in shape.
No. Only the larger moons are spherical. Smaller moons do not have strong enough gravity to make themselves round and so are irregular in shape. Perfect example are Phobos and Deimos, the two tiny moons that orbit Mars.
Moons are inaminate, therefore nothing about them can be meant. Please revise your question because it makes no sense.
Since all of the planets, and moons, and stars seem to have a spherical shape, it is possible that the universe may be a sphere.
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Larger moons have enough mass to gravitationally pull themselves into a spherical shape, and smaller ones do not.