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Meteorites
Meteorites are naturally occurring objects that originate in and fall to the ground through Earth's atmosphere.
The bright streaks that they produce while moving through Earth's atmosphere are known as a meteors.
There are three main types of meteorites. Irons, which are primarily made up of silicate minerals such as olivine, pyroxene and feldspar. Stones, are mainly composed of iron but also contain a significant amount of nickel. Stoney-Irons, are a mixture of stony and metallic materials.
Check out a vodeo at:
http://science.discovery.com/videos/meteorite-men-fireballs.html
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