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land soils fossils
| Term | Definition |
|---|---|
| bedrock | unweathered rock that lies below the subsoil; some material in the soil may have come from the bedrock |
| delta | a large mass of sediment deposited at the mouth of a river |
| deposition | the dropping of sediment by wind, water, ice or gravity |
| erosion | the movement of weathered rock material from one place to another |
| fossil | the remains of a plant or animal that lived long ago and is preserved in some way |
| glacier | a large mass of slow moving ice that flows down a slope |
| humus | the decayed remains of plants and animals |
| paleontologist | a scientist who studies fossils and organisms that lived long ago |
| soil | bits of rock, minerals, and material that were once part of once living things |
| subsoil | the bottom layer of soil, it contains small pieces of rock and very little humus. The soil particles are larger and lighter in color than topsoil |
| topsoil | the uppermost level of the soil, best soil to grow plants because it contains a large amount of humus which provides nutrients needed for plants to grow properly. The particles are dark and small. |
| weathering | the slow breaking apart or wearing away of rock into smaller pieces |
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