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abyssal

Overview page. Subjects: Ecology and Conservation — Earth Sciences and Geography.

Applied to the deepest part of the ocean, below about 2000 m. The abyssal zone covers approximately 75% of the ocean floor. Compare bathyal; neritic.

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acidophile

Overview page. Subjects: Ecology and Conservation — Earth Sciences and Geography.

An extremophile (domain Archaea) that thrives in environments where the pH is below 5.0.

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acme zone

Overview page. Subjects: Earth Sciences and Geography — Ecology and Conservation.

Informally, a body of strata that contains the maximum abundance of a particular fossil taxon occurring within the stratigraphic range of that taxon, and after which the zone is named.

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activity

Overview page. Subjects: Earth Sciences and Geography — Ecology and Conservation.

A broadly used term which refers to the rate or extent of a change associated with some substance or system. For example, it may be the tendency of a metal high in the electromotive series...

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actualism

Overview page. Subjects: Ecology and Conservation — Earth Sciences and Geography.

The theory that present-day processes provide a sufficient explanation for past geomorphological phenomena, although the rate of activity of these processes may have varied. The theory was...

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adobe

Overview page. Subjects: Ecology and Conservation — Earth Sciences and Geography.

A silty clay, often calcareous, found in dry, desert-lake basins. This fine-grained sediment is usually deposited by desert floods which have eroded wind-blown loess deposits. The term is...

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adret

Overview page. Subjects: Earth Sciences and Geography — Ecology and Conservation.

Applied to the south-facing slopes of Alpine valleys, which receive a high degree of insolation as a result of their aspect. Cultivation and settlement patterns often favour such slopes....

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aeolianite

Overview page. Subjects: Ecology and Conservation — Earth Sciences and Geography.

General term for the sedimentary products of wind (aeolian) deposition.

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aerodynamic roughness

Overview page. Subjects: Ecology and Conservation — Earth Sciences and Geography.

An uneven flow of air caused by irregularities in the surface (which may be that of a solid or of air of different density) over which the flow takes place.

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Aftonian

Overview page. Subjects: Ecology and Conservation — Earth Sciences and Geography.

The earliest (1.3–0.9 Ma) of four interglacial stages in N. America, following the Nebraskan glacial episode, and approximately equivalent to the Donau/Günz interglacial of Alpine...

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