| Title | Comment | Keywords |
|---|---|---|
| Soil Horizons | 15:35 - 16:19 (00:44) / 1.0 MB | weathering, soil, rock, horizon, "loamy topsoil", "A horizon", "B horizon", "C horizon", humus, plant, rainfall, water, leaching |
Coastal & Marine Geology InfoBank
USGS CMG InfoBank Geology School: A horizon |
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