GEO 110 Lecture : Lecture 1 Notes.docx
31 Aug 2013
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Document Summary
Sun was formed when gravity pulled material towards the centre (swelling motion) Accretion, small grains buildup to form fist sized planets (planet tesema) Asteroids and comets occasionally collide into the earth. The earth"s four spheres: geosphere: solid earth: core( 6000 c ;fluid but solid), mantle (2900km contributes to the largest component of the earth), crust. Mantle: inner (soft, plastic, and weak) & outer (cooler, solid) 80% of the earth. Asthenosphere: area between the outer mantle and the crust reason why we have tectonic plate activity. Lithosphere (mantle and crust collectively): thinnest layer: hydrosphere: water sources, riverine, lacustrines (collective lakes), palustrine (collective wetland, marshes), ocean . Other sources of water come from frozen ice (i. e. greenland, arctic & antarctic circles 1. 8% fresh water) Rivers, lakes (fresh water) account for <1% Aquifer: regions of subterarian water supply- underground layer of water (sandwiched btw 2 impermeable layers or an overlying permeable layer and underlying permeable material)
