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A Micrometeorite is an particle, ranging in size from 50 µm to 2 mm, usually found on the Earth's surface, and they are essentially micrometeoroids which have survived entry through the Earth's atmosphere. Micrometeorites differ from meteorites in being of smaller sizes, more plentiful, different in composition and are a subset of cosmic dust, which also includes the smaller interplanetary dust particles (IDPs).
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