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The time lapse between volcanic eruptions

Having the shape of a kidney

Another term for the shape of the earth surface at a specific point

The layer of rocks, gravel, sand, soil and other matter between surface and bedrock

A loose mass of rock fragments

See Net Smelter Return

A unit of measuring exposure doses of X-ray or gamma radiation

Any natural mineral, alone or in combination

A large pile of boulders and gravel, collected and concentrated by the action of a river or other channel

A tetragonal mineral and ore of titanium, TiO2