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Polishing pond

A last stage of settling for industrial effluent prior to release in the natural environment

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Plutonic formation

A plutonic formations, including laccoliths , are created when volcanic fluids are trapped beneath another rock body, causing the overlying rock to form a dome shaped upheaval

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Plutonic

Refers to rocks from plutons transported from great depth

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Pluton

An intrusive igneous body, usually measured in kilometers

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Plug

A small offshoot of solid lava from a larger flow

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Pleochroism

The property of a mineral where the colour of grains vary with angle observed