GEOSCI 100 Study Guide - Midterm Guide: Schist, Supercontinent, Headwall
Document Summary
Chapter 1: the earth is a system - introduction. The process: physical weathering - exposing it to wind, rain, ice, ex. Or: chemical weathering - dissolution by acid rain, ex. Physical abrasion - sand grains blasting on the rock. Classification: biochemical - skeletal remains, chemical - precipitation sedimentation. Lithification - the process in which sediments compact under pressure, expel connate fluids, and gradually become solid rock. Graded bed: large grains on the bottom, small grains on the top. Decreasing speed of water going from bottom to top. Cross beds: sand dunes create them - indicates there used to be a giant desert the way the wind is blowing determines what it looks like. Id using texture and composition: siliciclastic - fragments of silicate minerals, biochemical - skeletal debris, chemical - inorganic precipitation, biochemical & chemical rocks cannot be classified through degree of sorting or degree of rounding. Sedimentary rocks tell us about ancient climates and climate.
