Typically, meteoroids breaks apart during flight through the atmosphere. Much of the material evaporates in a process called ablation, leaving only small stones to find. Occaisionally, large meteor events can drop meteorites as large as several kilograms, but it is much more likely to find the smaller, more numerous fragments, in the 10 to 100 gram size range.
My name is Jim Goodall, and I am an automotive controls engineer in the Detroit area, but my passion is physics. I started this website as a hobby, to support the global network of meteorite hunters.
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