The moon and the Earth are different sizes, so the number of large craters on the Earth will be different from the number of large craters on the moon.
(The moon and the Earth; are; different sizes) (the number of large craters on the Earth; will be; different from the number of large craters on the moon)
The moon and the Earth the number of large craters on the Earth
are will be
different sizes
different from the number of large craters on the moon