Hello Item! A really good question! They come in all sorts of sizes, just like rocks on Earth. Some of them are less than a millimetre in size because they have been broken up by meteorite impacts, and some are over a meter in size and are called boulders. The Moon doesn’t have any water (or rain) to wear-down the rocks so any damage comes from meteorite impacts….some are so big they create large craters! : -)
Comments