BIOL 1202 : Exam 2 Pollock
Document Summary
Sedimentary rocks : form at surface, only make up about 8% volume crust, surface veneer, cover a lot of earth, cover basement. Igneous and metamorphic rock layered rocks: construction: roads, tunnels, buildings, houses need to be concerned with fossil fuels, coal, lot of drinking water sedimentary rocks. Clastic sedimentary rocks: loose particles ( clastic ) often called clasts=grains, minerals or small rock fragments, 5 steps to make a clastic sedimentary rock, 1. Weathering: disintegration of bedrock (all igneous and metamorphic rock: bedrock becomes soil if stays in place, 2. Erosion: separates debris from substrate removal of disintegrated bedrock fall by gravity; scouring by water/ice: movement by air, water, or ice, dissolution, 3. Transportation: path sediment moves: gravity, water, ice and wind carry particles, depends on velocity and viscosity of the medium that is moving it, ex: ice (highest viscosity) can carry all sizes of particles (glacier)
