Soil horizon
Soil horizon
Soil layer whose physical characteristics differ from the layers above and beneath.
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Readers' pathsAug 2026 – Oct 2026
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World Reference Base for Soil Resources
International soil classification system.
15%
Bedrock
Solid rock under loose surface material.
12%
Soil formation
Process of soil formation.
9.8%
Humus
Organic matter in soils resulting from decay of plant and animal materials.
8.1%
Soil type
Taxonomic unit.
7.5%
Subsoil
Layer of soil under the topsoil on the surface of the ground.
7.5%
Stratum
Layer of sediment, rock or soil with internally consistent characteristics.
6.1%
Soil
Earth, a natural material.
5.3%
Topsoil
Topmost part of the soil layer.
4.8%
Soil classification
Systematic categorization of soils.
4.1%
Readers come from
Share of the 1,234 readers arriving from another article
Soil
Earth, a natural material.
13%
Mima mounds
Geological mound formation.
11%
Plant litter
Dead plant material that has fallen to the ground.
8.1%
Subsoil
Layer of soil under the topsoil on the surface of the ground.
6.7%
Humus
Organic matter in soils resulting from decay of plant and animal materials.
6.6%
Entisol
Type of soil.
5.9%
Soil formation
Process of soil formation.
4.3%
Topsoil
Topmost part of the soil layer.
4.1%
Soil science
Study of soil as a natural resource on the surface of Earth.
4%
Vertisol
Clay-rich soil, prone to cracking.
4%