If the moon were to be vaporized out of existence right now, the earth would be affected as a whole because the moon tugs out tides towards it and the water itself is basically trying to tug against it, thus, high tide and low tide was created to show this. The moon has craters on it's surface because after the rocks gathered to create the moon, the moon was hit by other space rocks at high speeds which is why some craters are larger than others.