Most individual meteors are quite small, but occasionally there are some weight many tones. They are usually destroyed entirely by heat when they pass through the earth’s atmosphere. Only the larger ones reach the earth. When a piece of meteor reaches the earth’s it is called a "meteorite".
The largest one found so far weighs between 60 and 70 tones and is still in its resting place in Africa.
There are two main kinds of meteorites. There are those composed chiefly or nickel and iron. These are called the "metallic" meteorites. Some are composed of mineral and lock like a piece of a igneous rock (rock formed by intense heat).
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