The moon's make-up:
The moon is composed of iron and rock. The crust is the top layer of the moon. The crust is made of rock. Most of this rock has been crushed into dust by objects, such as an asteroid, hitting the moon. The mantle is a thick layer of rock lying under the crust. Scientists think the moon may have a small iron core.
Maria and Craters:
Maria are the large dark areas of the moon. Lava created Maria millions of years ago. The lava broke through the crust and flooded craters. Craters are bowl-shaped dots on the moon's surface. The craters are formed when objects hit the surface of the Moon. One of the craters is larger than Canada, but some are just pinpricks in the dust.
No atmosphere on the Moon:
Atmosphere is formed by gases. Some moons and most planets have an atmosphere because they are surrounded by a layer of gases. The Moon has no atmosphere, so the Moon has no weather or clouds. You have to have an atmosphere for these things to exist.