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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 |