A horizon

Noun

Meaning

the top layer of a soil profile; usually contains humus

Source: WordNet

Alternative names

A-horizon

Synonyms

horizon topsoil A horizon surface soil uppermost layer weathered layer soil upper layer eluviated layer decomposed layer eluvial layer fertile layer humus layer leached layer mineral soil nutrient-rich layer
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Examples

After sufficient time, humus moves downward and is deposited in a distinctive organic surface layer called the A horizon. Source: Internet

A horizon line is placed at its center—tapping an area above it sets the drone on a path toward that object while ascending, and tapping below it moves the Phantom in that direction while descending. Source: Internet

Commonly found on unconsolidated river and beach sediments of sand and clay or volcanic ash, some have an A horizon on top of bedrock. Source: Internet

The cycles of evolution of soils have very variable durations, between tens, hundreds, or thousands of years for quickly evolving soils (A horizon only) to more than a million years for slowly developing soils. Source: Internet

Close letter words and terms

a homemaker a hoot and a holler a horde of a horse of a different color a house of cards a household name