GEOG 2110L Lecture Notes - Water Cycle, Absolute Dating, Uniformitarianism
17 Mar 2014
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Document Summary
* a method of indicating the age of the earth. * a sequence based on relative positions of rock strata(layers) * assumes superposition: that younger rocks & sediments are near the top of a formation, & older material is near the bottom. * absolute ages are determined by methods such as radioactive isotope dating. ** the vast cycling of material that occurs in and on the lithosphere, encompassing the hydrologic, tectonic, & rock cycles. * the building and wearing down of landforms. * 3 components: hydrologic cycle: tectonic cycle: rock cycle: * mineral: an element or combination of elements that forms an inorganic natural compound which has specific qualities, such as a unique crystalline structure, hardness, etc. Ex: silicates, based on silicon(si); carbonates, based on carbon(c) (these together make-up 90% of all minerals. ) * 3000 minerals, only about 10-20 make up 90% of the crust. * sometimes as a mass of a single mineral.
