At this site, students can learn that chondrites containing tiny spheres called chondrules formed in the first several million years of our solar system's history and that the first rocks to condense in our solar system are known as calcium-aluminum inclusions, or CAIs, which can still be found in certain primitive meteorites. Students can watch an animation showing remaining particles within a solar nebula colliding to form larger objects and learn that the matrix of a meteorite often contains metals, predominantly iron. This site explains that meteorites can also be linked to their parent body and that their composition will vary depending on their temperature at formation.