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SOIL
| Term | Definition |
|---|---|
| loam | the most fertile type of soil |
| humus | decaying parts of plant animals in the soil |
| clay | smallest soil particle |
| sand | largest soil particle |
| sand | particles from 2 to .05 millimeters |
| silt | particles from .05 to .002 millimeters |
| clay | particles smaller than .002 millimeters |
| clay | the type of soil that holds most water |
| sand | type of soil that holds less water |
| technology | the practical use of science |
| agriculture | the science to produce food, shelter and fiber |
| applied and basic | the two types of agriculture |
| pH | potential hydrogen |
| pH | measures acidity or alkalinity |
| 0 to 14 | range of the pH scale |
| 0 to less than 7 | range of the pH for an acid |
| more than 7 to 14 | range of the pH for a base or alkaline |
| pH 7 | neutral |
| soil profile | the different layers of soil in an area |
| Horizon | one of the layers of a soil profile |
| Horizon-O | top layer of a soil profile |
| Horizon-A | second layer of a soil profile |
| Topsoil | another name for Horizon-A |
| subsoil | another name for Horizon -B |
| Horizon-B | second layer of soil profile |
| Horizon-R | the layer known as bedrock |
| parent material | material from which soil is made |
| weathering | the process of changing rocks to soil |
| fauna | the animals indigenous to an area |
| flora | the plants indigenous to an area |
| cohesion | a force that attracts molecules of the same type |
| adhesion | a force that attracts different types of molecules |
| tilth | the general condition of the soil with respect to texture, moisture and drainage |
| texture | the property caused by the amount of sand, silt and clay in the soil |