LIFESCI 2H03 Chapter Notes - Chapter 1-2, 8: Gaia Hypothesis, Global Warming, Positive Feedback
25 Dec 2015
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Document Summary
Greenhouse gases: gases that warm earth"s surface by absorbing outgoing infrared radiation and reradiating some of it back toward the surface. Ozone layer protect earth"s surface from uv. Global warming is warming of earth"s atmosphere due to anthropogenic enhancement of greenhouse effect. Earth system is a group of components that interact: Atomsphere-thin envelope of gases the surrounds earth. Solid earth all rocks, mixture of crystalline materials called minerals. Forests take in co2 from atmosphere in summer, and give out co2 in winter. Coal burning releases so2 which cools atmosphere but also causes acid rain, but burning of coal releases co2 causing earth temp to increase more than cool. Arctic ice metling not affect sea level but the melting of land ice cap does. Stratosphere- where earth"s most ozone is located, from 10km to 50km in altitude and the ozone in this layer absorbs suns harmful uv rays. Chlorine breaks ozone layer and cfc reasons why we have ozone hole.
