GEOL 101 Study Guide - Midterm Guide: Mariana Trench, Silicate Minerals, Seafloor Spreading
Document Summary
6. 1 weathering- disintegration and decomposition of rocks on the surface of earth. 6. 2 mechanical weathering- physical forces break down the rock without altering its composition. Water and carbonic acid- dissolved oxygen or co2 attacks and alters rock. Silicate minerals: forms soluble products like sodium, calcium, Spheroidal-sharp edges get altered first and works inward. Different rocks weather at different rates due to their composition. Rocks weather in heated environments, and water to facilitate them. Decompose quickly in hot wet climates and slowly in cold dry conditions. Soil is a combination of organic matter, water, air. Young vs old soil has different characteristics that lead to weathering rates. 6. 8 classifying soils: there is a soil taxonomy. 6. 10 weathering and ore deposits concentrates metal deposits. Weathering (physical/chemical disintegration)-> soluble constituents carried by runoff and groundwater->desposition by wind and water currents slowing down- 7. 3 detrital sedimentary rocks: clay, feldspars and micas. 7. 4 chemical sedimentary rocks: limestone, dolostone, chert, evaporates.
