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Animal unit

A standard measure, based on feed requirements, used to combine various classes of livestock according to size, weight, age, and use. For federal lands, an animal unit represents one mature cow, bull, steer, heifer, horse, mule, or five sheep, or five goats, all over six months of age.

Annex I Parties

Industrialized countries that, as parties to the Framework Convention on Climate Change, have pledged to reduce their greenhouse gas emissions by the year 2000 to 1990 levels. Annex I Parties consist of countries belonging to the Organization for Economic Cooperation and Development (OECD) and countries designated as Economies-in-Transition.

Annual flood

The highest peak discharge in a water year.

Annual flood series

A list of annual floods.

Antarctic "Ozone Hole"

Refers to the seasonal depletion of stratospheric ozone in a large area over Antarctica. See ozone, ozone layer.

Antecedent precipitation index

An index of moisture stored within a drainage basin before a storm.

Anthracite

A hard, black, lustrous coal containing a high percentage of fixed carbon and a low percentage of volatile matter. Often referred to as hard coal. See coal.

Anthropogenic

Human made. In the context of greenhouse gases, emissions that are produced as the result of human activities.

Anticline

A fold of rock layers that is convex upwards. Antonym of syncline.

Anticyclone

A large area of high pressure around which the winds blow clockwise in the Northern Hemisphere.

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