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The Frequency with Which an Object Is Encountered as a Category

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The frequency with which an object is encountered as a category member,such as Coca-Cola as a cola,often makes it a


Definitions:

Gold Ore

A type of rock that contains sufficient minerals with important elements including gold; the ores are extracted through mining.

Caldera

A broad volcanic depression, generally the result of a substantial eruption followed by the fall-in of the volcano's opening.

Banded Iron Formations

Layers of iron-rich minerals alternated with silica or chert, deposited in marine environments over 2.5 billion years ago and are important iron ore sources.

Metal-rich Fluids

Liquids emanating from the Earth's crust, usually heated by magma, that are high in dissolved metals, often found in volcanic and hydrothermal areas.

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