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Earth Science Daily Challenge, 12/11 What are the rocks around here like? Describe some of their characteristics. SEDIMENTARY ROCKS • made from small pieces of other rocks • • sediments or dissolved solids processes that make sedimentary rock 1) weathering – breaking up of materials into sediments and dissolved solids 2) erosion – transportation of materials by wind, water, ice, and/or gravity 3) deposition – laying down/settling of materials 4) lithification • compaction – squeezing together of materials • cementation – natural gluing of materials SEDIMENTARY ROCKS classified by type & size of grains • Clastic – from mineral sediments – SHALE made of clay size particles – SANDSTONE made of sand sized particles – CONGLOMERATE a mix of larger particles (BRECCIA) • Organic – from once-living things – COAL made of dead trees & swamp plant – LIMESTONE made of shells of sea creatures (reefs) • Chemical – from crystallization of dissolved solids – ROCK SALT halite crystallized via evaporation – ROCK GYPSUM gypsum crystallized via evaporation – LIMESTONE calcite crystallized via evaporation Mudcracks Ripple Marks