Question

what best explains why the moons surface gravity is only one - sixth of earths surface gravity?
a earth is closer to the sun, so it has much more gravity.
b gravity is controlled by the tides, which are much closer to earth than the moon
c the moon orbits earth faster than earth orbits the sun, giving the moon less gravity
d gravity is the result of an objects mass and size, the earth is much larger than the moon

Explanation:

Gravity of an object depends on its mass and size. Earth is larger and more massive than the Moon. Option A is wrong as distance to Sun doesn't determine Earth's gravity compared to Moon. Option B is incorrect as tides are affected by gravity, not the other way around. Option C is wrong as orbital speed doesn't determine surface gravity.

Answer:

D. Gravity is the result of an object's mass and size, the Earth is much larger than the moon.