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Weathering/Fossils
Term | Definition |
---|---|
Weathering | Breakdown of rocks |
Mechanical | Physically breaking rocks |
Ice wedging | Water freezes and cracks rocks |
Pressure Release | Exfoliation; rocks coming of in layers |
Plant Roots | Plant roots crack rocks |
Abrasion | Rocks wear down from water and waves |
Chemical | Rocks breakdown chemically |
Acid Rain | Causes weathering by dissolving minerals in rocks |
Rust | Iron minerals in the rocks mix with water and oxygen to form rust |
Three Factors | Surface area, rock composition, and climate |
Erosion | Weathered rock particles are moved |
Fossils | Traces, remains, or evidance of living things |
Sedimentary Rocks | Where most fossils are found |
Mold Fossil | A layer of sediment covers the organism; impression |
Cast Fossil | When a mold is filled in; makes a copy |
Trace | Footprints, burrows, feces, etc. |
Amber | Fossilized tree sap |
Scientists | Can make predictions about the ecosystem based on fossils |