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a

a   Quick reference

A Dictionary of Ecology (5 ed.)

Reference type:
Subject Reference
Current Version:
2015

The usual abbreviation for *year (from the Latin annus, meaning year).

Aapa mires

Aapa mires   Quick reference

A Dictionary of Ecology (5 ed.)

Reference type:
Subject Reference
Current Version:
2015

*Fens, sometimes called ‘string bogs’, of circumpolar distribution, found in Fennoscandia (see Baltic Shield) and *boreal...

abaptation

abaptation   Quick reference

A Dictionary of Ecology (5 ed.)

Reference type:
Subject Reference
Current Version:
2015

The process by which an organism is fitted to its environment as a consequence of the characters it inherits, which have been filtered by ...

abaxial

abaxial   Quick reference

A Dictionary of Ecology (5 ed.)

Reference type:
Subject Reference
Current Version:
2015

Of a plant organ, facing away from the axis or main stem (e.g. the lower surface of leaves). Compare adaxial...

abiogenesis

abiogenesis   Quick reference

A Dictionary of Ecology (5 ed.)

Reference type:
Subject Reference
Current Version:
2015
The development of living organisms from non-living matter, as in the supposed origin of life on Earth, or in the concept of spontaneous generation which was once held to account for the ... More
abiotic

abiotic   Quick reference

A Dictionary of Geography (5 ed.)

Reference type:
Subject Reference
Current Version:
2015

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

abiotic

abiotic   Quick reference

A Dictionary of Ecology (5 ed.)

Reference type:
Subject Reference
Current Version:
2015

Non-living; devoid of life. Compare biotic.

ablation

ablation   Quick reference

A Dictionary of Geography (5 ed.)

Reference type:
Subject Reference
Current Version:
2015

Loss of snow and ice from a glacier by *sublimation, melting, and evaporation; and from the *calving

ablation

ablation   Quick reference

A Dictionary of Ecology (5 ed.)

Reference type:
Subject Reference
Current Version:
2015
1 Removal of snow and ice by melting and by direct alteration from the solid to the gaseous phase (sublimation). The rate of loss is controlled chiefly by air temperature, ... More
aborigine

aborigine   Quick reference

A Dictionary of Geography (5 ed.)

Reference type:
Subject Reference
Current Version:
2015

A member of an indigenous people existing in a land before invasion or colonization from outside. For Canadian aboriginal peoples,

abortion/anti-abortion conflict

abortion/anti-abortion conflict   Reference library

Science, Technology, and Society

Reference type:
Subject Reference
Current Version:
2006

The U.S. Supreme Court's 1973 ruling in Roe v. Wade legalized induced abortion in the first trimester of pregnancy “free

abrasion

abrasion   Quick reference

A Dictionary of Geography (5 ed.)

Reference type:
Subject Reference
Current Version:
2015

Also known as corrasion, this is the grinding away of bedrock by fragments of rock which may be incorporated in

abrasion

abrasion   Quick reference

A Dictionary of Ecology (5 ed.)

Reference type:
Subject Reference
Current Version:
2015

The erosive (see erosion) action that occurs when rock particles of varying sizes are dragged over or hurled against a surface. Some common agents of abrasion are the ...

abscission

abscission   Quick reference

A Dictionary of Ecology (5 ed.)

Reference type:
Subject Reference
Current Version:
2015

The rejection of plant organs (e.g. of leaves in autumn). This occurs at an abscission zone, where hydrolytic (see...

absolute age

absolute age   Quick reference

A Dictionary of Ecology (5 ed.)

Reference type:
Subject Reference
Current Version:
2015

The age of a geologic phenomenon measured in present Earth years, rather than its age relative to other geologic phenomena (...

absolute humidity

absolute humidity   Quick reference

A Dictionary of Geography (5 ed.)

Reference type:
Subject Reference
Current Version:
2015

The density of the water vapour present in a mixture of air and water vapour. Cold air cannot contain as

absolute plate motion

absolute plate motion   Quick reference

A Dictionary of Geography (5 ed.)

Reference type:
Subject Reference
Current Version:
2015

The movement of a crustal plate in relation to a fixed point, such as a hot spot, or latitude and

absolute pollen frequency

absolute pollen frequency   Quick reference

A Dictionary of Ecology (5 ed.)

Reference type:
Subject Reference
Current Version:
2015
The reporting of *pollen data from sediments, expressed in terms of the absolute numbers of pollen grains (for each species, genus, or family) per unit of area of surface and, where ... More
absorption

absorption   Quick reference

A Dictionary of Ecology (5 ed.)

Reference type:
Subject Reference
Current Version:
2015

The uptake of substances, usually nutrients, water, or light, by cells or tissues.

absorption spectrum

absorption spectrum   Quick reference

A Dictionary of Ecology (5 ed.)

Reference type:
Subject Reference
Current Version:
2015

A graph that shows the percentage of each wavelength of light absorbed by a pigment (e.g. chlorophyll, which absorbs mainly in the red and blue parts of the spectrum)....

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