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oil

March 12, 2018 by eclites

A naturally occurring, flammable liquid formed from dead organisms (particularly one-celled plankton) that become buried within sediments at the bottom of the sea. Oil forms after the organic remains have become buried by additional layers of sediment and are subjected to intense heat and pressure, causing chemical changes.

original horizontality

January 9, 2018 by ldwhite3

Sedimentary layers are originally deposited flat-lying due to gravity.

outcrop

July 3, 2017 by eclites

Any place where rock is visible or exposed on the surface of the Earth.

organism

May 26, 2017 by eclites

A living thing

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