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Earth science

Any of several geological sciences that are concerned with the earth, its origins, and all of its various structures and physical forms and phenomena.

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Earth science > Geology

ephemeral stream

Earth science; Geology

A stream drainage that is usually dry and fills with water only during brief episodes of rainfall. Many desert streams ephemeral.

epicenter

Earth science; Geology

The point on the Earth’s surface that is directly above the focus of an earthquake.

foliation

Earth science; Geology

A planar structure that develops in metamorphic rocks as a result of directed pressure.

formation

Earth science; Geology

A rock formation is a body of rock of considerable extent with distinctive characteristics that allow geologists to map, describe, and name it.

fossil fuel

Earth science; Geology

General term for any hydrocarbon used as fuel, including coal, oil, natural gas, and oil shale.

fracture

Earth science; Geology

Any break in rock along which no significant movement has occurred.

freeze-thaw cycle

Earth science; Geology

In colder temperate regions, water trapped in fractures and between grains of rocks repeatedly freezes, then thaws during the winter months. In some areas this occurs on a daily ...