ENV100Y5 Chapter 14: ENV100 chapter 14
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ENV100Y5 Full Course Notes
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Atmosphere thin layer of gases that surrounds earth. Made up of &8% nitrogen, 21% oxygen and 1% argon gas and other gases. Troposphere (cid:271)otto(cid:373) laye(cid:396), (cid:271)la(cid:374)kets ea(cid:396)th"s su(cid:396)fa(cid:272)e; p(cid:396)o(cid:448)ides ai(cid:396) (cid:449)e (cid:374)eed to li(cid:448)e. _____---much denser near earth"s su(cid:396)fa(cid:272)e. temperature decreases as you move up with. Temperature stops decreasing once you hit the stratosphere. Stratosphere extends from 11km-50kms above sea level. 1000 times as dry and less dense as troposphere. Max temp of -3 degrees c at highest altitude, lower temps at lower altitude. Oxygen and ozone deflect uv at the top of stratosphere, preventing it from reaching the lower stratosphere. Air moving in troposphere is responsible for weather. Thi(cid:374)(cid:374)est laye(cid:396), ho(cid:449)e(cid:448)e(cid:396) (cid:272)o(cid:374)tai(cid:374)s 3 (cid:395)ua(cid:396)te(cid:396)s of the at(cid:373)osphe(cid:396)e"s (cid:373)ass (cid:271)e(cid:272)ause ai(cid:396) is. Ozone layer greatly reduces amount of uv radiation that (cid:396)ea(cid:272)hes ea(cid:396)th"s su(cid:396)fa(cid:272)e. vital for life on earth b/c uv can damage tissue and cause dna mutations. Extremely low air pressure temp decreases with altitude.
