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aa

aa  

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.
aa

aa   Quick reference

A Dictionary of Environment and Conservation (3 ed.)

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Subject Reference
Current Version:
2017

Volcanic **lava rock that is thick and porous and has a rough, jagged surface when it cools. It

abandoned well

abandoned well  

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.
abandoned well

abandoned well   Quick reference

A Dictionary of Environment and Conservation (3 ed.)

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Subject Reference
Current Version:
2017

Any *well that has not been used for a long time and/or is not properly sealed, and is so

abatement

abatement   Quick reference

A Dictionary of Environment and Conservation (3 ed.)

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Subject Reference
Current Version:
2017

The elimination or reduction of emissions that create *pollution. Examples include smoke abatement and noise abatement.

abatement debris

abatement debris  

Waste materials produced by remediation activities.
abatement debris

abatement debris   Quick reference

A Dictionary of Environment and Conservation (3 ed.)

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Subject Reference
Current Version:
2017

Waste materials produced by *remediation activities.

Abbey, Edward

Abbey, Edward (1927–89)   Quick reference

A Dictionary of Environment and Conservation (3 ed.)

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Subject Reference
Current Version:
2017

who wrote the book *Desert Solitaire and is remembered for his strong criticism of public land policies and his

abiotic

abiotic   Quick reference

A Dictionary of Environment and Conservation (3 ed.)

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Subject Reference
Current Version:
2017

Devoid of life, not *biotic, non‐biological. That part of a natural environment that comprises only chemical or physical

ablation

ablation   Quick reference

A Dictionary of Environment and Conservation (3 ed.)

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Subject Reference
Current Version:
2017

1. The process by which *snow or *ice is lost from a *glacier or *ice cap

ablation

ablation   Quick reference

A Dictionary of Weather (2 ed.)

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Subject Reference
Current Version:
2008

The removal of surface snow or ice by sublimation, melting, or evaporation. The term is sometimes extended to

ablation zone

ablation zone  

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 accumulation zone.
ablation zone

ablation zone   Quick reference

A Dictionary of Environment and Conservation (3 ed.)

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Subject Reference
Current Version:
2017

The lower part of a *glacier, where in the course of a year more ice is lost by

ablation zone

ablation zone   Quick reference

A Dictionary of Weather (2 ed.)

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Subject Reference
Current Version:
2008

The zone of a glacier in which losses through various processes, such as calving, deflation, melting, etc., exceed any

abrasion

abrasion   Quick reference

A Dictionary of Environment and Conservation (3 ed.)

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Subject Reference
Current Version:
2017

The *physical weathering or mechanical weathering of rock or sediment by running water, glaciers, or wind loaded with fine

abroholos

abroholos   Quick reference

A Dictionary of Weather (2 ed.)

Reference type:
Subject Reference
Current Version:
2008

A violent squall, particularly prevalent in summer, that occurs off the south-eastern coast of Brazil.

absolute chronology

absolute chronology  

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

absolute humidity  

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.
absolute poverty

absolute poverty  

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.
absolute relief

absolute relief  

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

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