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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
Created by: s35518