 | Term | Definition |
| |
humus |
the decayed remains of once-living things |
| |
soil |
a mixture of rocks, mineral fragments, and the remains of living things |
| |
loam |
rich soil made of clay, sand and humus |
| |
horizon |
a layer of soil in a soil profile |
| |
soil profile |
a selection of soil that includes all of the different layers of soil |
| |
topsoil |
the top layer of soil, which has the smallest grains and the most humus |
| |
erosion |
the movement of soil across the land |
| |
irrigation |
the watering of the land to help crops grow |
| |
plowing |
the turning and loosening of soil for the planting of crops |
