Meteors are pieces of rock that are burning up through the Earths atmosphere. Meteorites and Meteoroids are also in this group of rocks. Meteorites are hitting the Earths surface and Meteoroids are always in space.
These are huge pieces of rock and are in the asteroid belt. They are pieces of rock that were left out in the process of the planets being born.
These are pieces of rock, ice, and dust that orbit the our solar system in the Kuiper belt.