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Sasser S6E5h
Earth Science
| Term | Definition |
|---|---|
| soil | a loose mixture of rock fragments, organic material, water, and air that can support the growth of vegetation (plants) |
| parent rock | a rock formation that is the source of soil |
| bedrock | the layer of rock beneath soil |
| soil texture | the soil quality that is based on proportions of soil particles |
| soil structure | the arrangement of soil particles |
| humus | the dark, organic material formed in soil from the decayed remains of plants and animals |
| leaching | the removal of substances that can be dissolved from rock, ore, or layers of soil due to the passing of water |
| O layer | has a lot of decaying leaves and twigs. Very dark in color. Very rich in humus. Very few rocks. Part of topsoil. |
| A layer | Also part of the topsoil. Material from the O layer leaches down into this layer. Dark in color. Mostly humus & weathered clay. Very few rocks. |
| B layer | VERY LITTLE humus. Lighter in color. More clay and small rocks than upper layers. |
| C layer | Almost no humus. Mostly clay, sand, and larger broken-off pieces of bedrock. |
| decomposers | organisms that break down the remains of dead plants and animals. |
| litter | The loose layer of leaves or plant remains on the ground. |
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bsasser
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