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weathering/fossil
| Question | Answer |
|---|---|
| Weathering | breakdown of rocks |
| mechincal | physically breaking rocks |
| ice wedging | water freezes and cracks rocks |
| pressure release | exfoliation; rocks come off 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, climate |
| erosion | weathered rock particles are moved |
| fossils | traces, remains, or evidence of living things |
| sedimentary rocks | where most fossils are found |
| mold fossil | a layer of sediment covers the organism |
| cast fossil | when a mold is filled in |
| trace | footprints, burrows, feces |
| amber | fossilized tree sap |
| scientists | can make predictions about the ecosystem based on fossils |