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S  0z  ``   X*  0  `    Z*  0  `    Z*B  s *޽h ? ̙33 Default Design  0 0 (   r  S X    l  <p P  vVisit www.worldofteaching.com For 100 s of free powerpoints>       0H  0޽h ? ̙33g 0  ~(  RB  s *D``  0` P G4 billion years ago 2  0D 0 7Now 2  0  T,$D 0 EVolcanic activity 2  0 ,$D 0 IMainly carbon dioxide 2   0 oC,$D 0 Z&Some methane, ammonia and water vapour' 2'   0, ',$D 0 W%Water vapour condenses to form oceans&&   0 *,$D 0 A Plants evolve   0 L,$D 0 G3 billion years ago 24   0 yM,$D 0 lPlants give out oxygen  atmosphere polluted by oxygen7 27  0 ",$D 0 TCarbon & carbon dioxide taken in by sedimentary rocks as carbonates and fossil fuelsU 2U@  0, Y-,$D 0 xMethane & ammonia react with oxygen  some nitrogen produced= 2=  0, n,$D  0 r>Nitrogen produced by organisms including denitrifying bacteria? 2?  0, i,$D  0 j6Micro-organisms that cannot tolerate oxygen killed off7 27  0 c"# ,$D  0 G2 billion years ago 2  0L | P ,$D  0 QOxygen results in ozone layer 2  0h   ,$D  0 f2Ozone layer filters out harmful ultra violet light3 23  0,  1 ,$D  0 G1 billion years ago 2  04   ,$D  0 Z&This allows evolution of new organisms' 2'  0 l @,$D 0 ^*Atmosphere for the past 200 million years:+ 2+  0 0,$D 0 > 20% Oxygen 2   0 q,$D 0 PSmall amounts of other gases including water vapour, carbon dioxide, noble gasesQ 2Q  0 ,$D 0 @ 80% Nitrogen 2 H  0޽h ? ̙33QQ___PPT10Q+>ˠDM'  = @B DtM' = @BA?%,( < +O%,( < +D{' =%(D#' =%(D' =A@BBBB0B%(D' =1:Bvisible*o3>+B#style.visibility<*%(D' =+4 8?dCB0-#ppt_w/2BCB#ppt_xB*Y3>B ppt_x<*D' =+4 8?\CB#ppt_yBCB#ppt_yB*Y3>B ppt_y<*D{' =%(D#' =%(D' =A@BBBB0B%(D' =1:Bvisible*o3>+B#style.visibility<* %(D' =+4 8?dCB0-#ppt_w/2BCB#ppt_xB*Y3>B ppt_x<* D' =+4 8?\CB#ppt_yBCB#ppt_yB*Y3>B ppt_y<* D{' =%(D#' =%(D' =A@BBBB0B%(D' =1:Bvisible*o3>+B#style.visibility<*%(D' =+4 8?dCB0-#ppt_w/2BCB#ppt_xB*Y3>B ppt_x<*D' =+4 8?\CB#ppt_yBCB#ppt_yB*Y3>B ppt_y<*D{' =%(D#' =%(D' =A@BBBB0B%(D' =1:Bvisible*o3>+B#style.visibility<* %(D' =+4 8?dCB0-#ppt_w/2BCB#ppt_xB*Y3>B ppt_x<* D' =+4 8?\CB#ppt_yBCB#ppt_yB*Y3>B ppt_y<* D{' =%(D#' =%(D' =A@BBBB0B%(D' =1:Bvisible*o3>+B#style.visibility<* %(D' =+4 8?dCB0-#ppt_w/2BCB#ppt_xB*Y3>B ppt_x<* D' =+4 8?\CB#ppt_yBCB#ppt_yB*Y3>B ppt_y<* D{' =%(D#' =%(D' =A@BBBB0B%(D' =1:Bvisible*o3>+B#style.visibility<* %(D' =+4 8?dCB0-#ppt_w/2BCB#ppt_xB*Y3>B ppt_x<* D' =+4 8?\CB#ppt_yBCB#ppt_yB*Y3>B ppt_y<* D{' =%(D#' =%(D' =A@BBBB0B%(D' =1:Bvisible*o3>+B#style.visibility<*%(D' =+4 8?dCB0-#ppt_w/2BCB#ppt_xB*Y3>B ppt_x<*D' =+4 8?\CB#ppt_yBCB#ppt_yB*Y3>B ppt_y<*D{' =%(D#' =%(D' =A@BBBB0B%(D' =1:Bvisible*o3>+B#style.visibility<*%(D' =+4 8?dCB0-#ppt_w/2BCB#ppt_xB*Y3>B ppt_x<*D' =+4 8?\CB#ppt_yBCB#ppt_yB*Y3>B ppt_y<*D{' =%(D#' =%(D' =A@BBBB0B%(D' =1:Bvisible*o3>+B#style.visibility<*%(D' =+4 8?dCB0-#ppt_w/2BCB#ppt_xB*Y3>B ppt_x<*D' =+4 8?\CB#ppt_yBCB#ppt_yB*Y3>B ppt_y<*D{' =%(D#' =%(D' =A@BBBB0B%(D' =1:Bvisible*o3>+B#style.visibility<*%(D' =+4 8?dCB0-#ppt_w/2BCB#ppt_xB*Y3>B ppt_x<*D' =+4 8?\CB#ppt_yBCB#ppt_yB*Y3>B ppt_y<*D{' =%(D#' =%(D' =A@BBBB0B%(D' =1:Bvisible*o3>+B#style.visibility<*%(D' =+4 8?dCB0-#ppt_w/2BCB#ppt_xB*Y3>B ppt_x<*D' =+4 8?\CB#ppt_yBCB#ppt_yB*Y3>B ppt_y<*D{' =%(D#' =%(D' =A@BBBB0B%(D' =1:Bvisible*o3>+B#style.visibility<*%(D' =+4 8?dCB0-#ppt_w/2BCB#ppt_xB*Y3>B ppt_x<*D' =+4 8?\CB#ppt_yBCB#ppt_yB*Y3>B ppt_y<*D{' =%(D#' =%(D' =A@BBBB0B%(D' =1:Bvisible*o3>+B#style.visibility<*%(D' =+4 8?dCB0-#ppt_w/2BCB#ppt_xB*Y3>B ppt_x<*D' =+4 8?\CB#ppt_yBCB#ppt_yB*Y3>B ppt_y<*D{' =%(D#' =%(D' =A@BBBB0B%(D' =1:Bvisible*o3>+B#style.visibility<*%(D' =+4 8?dCB0-#ppt_w/2BCB#ppt_xB*Y3>B ppt_x<*D' =+4 8?\CB#ppt_yBCB#ppt_yB*Y3>B ppt_y<*D{' =%(D#' =%(D' =A@BBBB0B%(D' =1:Bvisible*o3>+B#style.visibility<*%(D' =+4 8?dCB0-#ppt_w/2BCB#ppt_xB*Y3>B ppt_x<*D' =+4 8?\CB#ppt_yBCB#ppt_yB*Y3>B ppt_y<*D{' =%(D#' =%(D' =A@BBBB0B%(D' =1:Bvisible*o3>+B#style.visibility<*%(D' =+4 8?dCB0-#ppt_w/2BCB#ppt_xB*Y3>B ppt_x<*D' =+4 8?\CB#ppt_yBCB#ppt_yB*Y3>B ppt_y<*D{' =%(D#' =%(D' =A@BBBB0B%(D' =1:Bvisible*o3>+B#style.visibility<*%(D' =+4 8?dCB0-#ppt_w/2BCB#ppt_xB*Y3>B ppt_x<*D' =+4 8?\CB#ppt_yBCB#ppt_yB*Y3>B ppt_y<*++0+0 ++0+0 ++0+ 0 ++0+ 0 ++0+ 0 ++0+ 0 ++0+0 ++0+0 ++0+0 ++0+0 ++0+0 ++0+0 ++0+0 ++0+0 ++0+0 ++0+0 ++0+0 +r@y1  !#$%&'()*+,-Oh+'0 `h  the earths atmosphere John Allengg7Microsoft PowerPoint@ 2u@fh@@J9Gg  *  y--$xx--'@"Arial-. 2 '( The Eartht."System9-@"Arial-.  2 'H.-@"Arial-. 2 'J s Atmosphere.---$jyIyIjj--'@Times New Roman-. 2 qVisit .-@Times New Roman-. *2 q www.worldofteaching.com.--q qG-@Times New Roman-. 2 wFor 100s.-@Times New Roman-.  2 w.-@Times New Roman-. 2 w s of free .-@Times New Roman-. 2 w' powerpoints.-՜.+,D՜.+,    lOn-screen Show.z Times New RomanArialDefault DesignThe Earths AtmosphereSlide 2  Fonts UsedDesign Template Slide Titles 8@ _PID_HLINKSAx http://www.worldofteaching.com/_ z0ggggCurrent User.&