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Geography

alluvia

Geography; Geography

Clay, silt, gravel, or similar detrital material deposited by running water.

alluvial soils

Geography; Geography

Soils deposited through the action of moving water. These soils lack horizons and are usually highly fertile.

anthracite

Geography; Geography

A hard coal containing little volatile matter.

arête

Geography; Geography

A sharp, narrow mountain ridge. It often results from the erosive activity of alpine glaciers flowing in adjacent valleys.

arroy

Geography; Geography

A deep gully cut by a stream that flows only part of the year; a dry gulch. A term normally used only in desert areas.

ash

Geography; Geography

Fragments less than (about 1/8 inch) in diameter of lava or rock blasted into the air by volcanic explosions.

Atlantic seaboard fall line

Geography; Geography

The physiographic border between the Piedmont and Atlantic coastal plain regions. The name derives from the river rapids and falls that occur as the water flows from the hard rocks of the higher ...

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