Geology

Geology

The science that comprises the study of the solid Earth and the processes by which it is shaped and changed.

Industry: Earth science

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Geology

Anhydrous

Earth science; Geology

Literally, "without water". Refers to minerals or other materials which do not have water as an primary constituent.

Alluvial fan

Earth science; Geology

As water slows down, it deposits sediment (alluvium) that gradually builds a fan.

Alluvium

Earth science; Geology

Sand, gravel, and silt deposited by rivers and streams in a valley bottom.

A dark, fine-grained, extrusive (volcanic) igneous rock with a low silica content (40% to 50%), but rich in iron, magnesium and calcium. Generally occurs in lava flows, but also as dikes. Basaltic ...

Asthenosphere

Earth science; Geology

The weak or "soft" zone in the upper mantle just below the lithosphere , involved in plate movement and isostatic adjustments. It lies 70 to 100 km below the surface and may extend to a depth of 400 ...

Avalanche

Earth science; Geology

A large mass of material or mixtures of material falling or sliding rapidly under the force of gravity. Avalanches often are classified by their content, such as snow, ice, soil, or rock avalanches. ...

Ash flow

Earth science; Geology

A pyroclastic flow consisting predominantly of ash-sized (less than 4 millimetres in diameter) particles. Also called a glowing avalanche if it is of very high temperature.