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aa

Overview page. Subjects: Environmental Science.

Volcanic lava rock that is thick and porous and has a rough, jagged surface when it cools. It is a Hawaiian word, pronounced ah‐ah.

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abandoned well

Overview page. Subjects: Environmental Science.

Any well that has not been used for a long time and/or is not properly sealed, and is so poorly maintained that it cannot be used for the purpose for which it was intended.

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abatement

Overview page. Subjects: Public Health and Epidemiology — Environmental Science.

Reduction or preferably elimination of public health hazards or nuisances such as environmental pollutants, noxious smells, excessive noise. Abatement is often an important activity in...

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abatement debris

Overview page. Subjects: Environmental Science.

Waste materials produced by remediation activities.

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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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absolute chronology

Overview page. Subjects: Environmental Science.

A chronology that determines the age of a feature or event in years. Contrast relative chronology.

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absolute dating

Overview page. Subjects: Archaeology — Environmental Science.

A range of methods for determining the absolute age of an object or material, for example using radiometric dating which measures the decay product produced by radioactive decay in...

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absolute humidity

Overview page. Subjects: Environmental Science — Earth Sciences and Geography.

The amount of water vapour in air, determined as the mass of vapour per unit mass of air, and normally given in grams per cubic metre. See also humidity; specific humidity.

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absolute poverty

Overview page. Subjects: Environmental Science.

An extreme state of poverty, in which the standard of living is below the minimum that is needed for the maintenance of life and health. Contrast relative poverty.

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absolute relief

Overview page. Subjects: Environmental Science.

The maximum elevation of a particular area above sea level. Contrast relative relief.

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