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OXIDATION

Usually refers to a chemical reaction in which an element combines with oxygen (usually in air or water). For instance, rusting is an oxidation reaction: iron oxidizes, that is it combines with oxygen, to form iron-oxides.

QUARTZ

The most common mineral on earth.

QUARTZITE

Quartz-rich sandstone that has been metamorphosed.

ROADCUT

An exposure of rock along a road, created when the road was excavated.

ROCK

A hard, solid mass composed of one or more minerals or other compounds.

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