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Impact crater

Cavities in the Earth’s surface, resultant of collisions between an asteroid or meteorite

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Igneous rocks

The simplest of the 3 main rock types which includes sedimentary and metamorphic, igneous rocks are formed immediately upon the cooling of molten material

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Interfluves

An elevated are between to moving water bodies, such as rivers or creeks, which run parallel to each other

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Imperial jade

A semitransparent variety of jadeite commonly used as a Gemstone. Usually found in China

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Insulate

To shield the passage of energy such as heat, sound and electricity

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Impact mill

An machine which processes mineral ore by mechanically crushing it between steel plates