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A. Penck

Overview page. Subjects: Earth Sciences and Geography.

(1858–1945)

A German mineralogist from the University of Berlin, Penck's main interest was in Quaternary glacial land-forms, which he classified according to shape. Some of his...

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Aalenian

Overview page. Subjects: Earth Sciences and Geography.

A stage in the European Middle Jurassic (175.6–171.6 Ma, Int. Commission on Stratigraphy, 2004). See also dogger.

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abandoned channel

Overview page. Subjects: Earth Sciences and Geography.

A former stream channel through which water no longer flows (e.g. a cut-off).

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abandonment facies association

Overview page. Subjects: Earth Sciences and Geography.

A facies association formed under conditions of rising sea level, when clastic deposition has ceased and sediment is deposited very slowly.

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abapical

Overview page. Subjects: Earth Sciences and Geography — Dentistry.

Opposite to or directly away from the apex.

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abiotic

Overview page. Subjects: Earth Sciences and Geography.

Not living, non-biological, usually describing factors in an ecosystem: atmospheric gases, humidity, salinity, soil mineral particles, water, and so on. An abiotic environment is one...

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ablation

Overview page. Subjects: Earth Sciences and Geography.

The removal of surface snow or ice by sublimation, melting, or evaporation. The term is sometimes extended to include snow removed by the wind (deflation) and also the calving of glaciers.

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ablation zone

Overview page. Subjects: Environmental Science — Meteorology and Climatology.

The zone of a glacier in which losses through various processes, such as calving, deflation, melting, etc., exceed any addition through snowfall or accumulation of rime ice. Compare...

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aboral

Overview page. Subjects: Zoology and Animal Sciences — Earth Sciences and Geography.

Away from the mouth; on the opposite side of the body from the mouth in animals that lack clear-cut dorsal and ventral surfaces.

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Abraham Gottlob Werner

Overview page. Subjects: Earth Sciences and Geography.

(1749–1817)

Professor of mineral science at the Mining Academy, Freiberg, who developed a system of mineral classification which he called ‘oryctognosy’, based on the external...

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