ࡱ> ?F  !"#$%&'()*+,-./0123456789:;<=>ABCDEGRoot EntrydO)fck@@ PowerPoint Document(ySummaryInformation(DocumentSummaryInformation8#(  H 4 www.pptpoint.comf/ 0DTimes New RomanDt\ )0tY 0DDArialNew RomanDt\ )0tY 0D"c .  @n?" dd@  @@`` (! 0AA@uʚ;2Nʚ;4CdCd )0h.ppppppP p0 ppp<4!d!d 0$E<4dddd 0$E 80___PPT10 ? %,The Earth s Atmosphere b100 s of free ppt s from www.pptpoint.com library2Z2>       0)   ` ` ̙33` 333MMM` ff3333f` f` f` 3>?" dd@,|?" dd@   " @ ` n?" dd@   @@``PR    @ ` ` p>> f(    6 P  T Click to edit Master title style! !  0t   RClick to edit Master text styles Second level Third level Fourth level Fifth level!     S  0 ``  >*  0Թ `   @*  0P `   @*B  s *޽h ? ̙33 Default Design    B(   r  S l     <  0  H  0޽h ? ̙33g 0~(  RB  s *D``  08pP G4 billion years ago 2  0t0 7Now 2  0w T,$D 0 EVolcanic activity 2  0 ,$D 0 IMainly carbon dioxide 2   0oC,$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-,$D 0 xMethane & ammonia react with oxygen  some nitrogen produced= 2=  00n,$D  0 r>Nitrogen produced by organisms including denitrifying bacteria? 2?  04i,$D  0 j6Micro-organisms that cannot tolerate oxygen killed off7 27  08c"# ,$D  0 G2 billion years ago 2  0;| P ,$D  0 QOxygen results in ozone layer 2  0?  ,$D  0 f2Ozone layer filters out harmful ultra violet light3 23  0\C 1 ,$D  0 G1 billion years ago 2  0G  ,$D  0 Z&This allows evolution of new organisms' 2'  0`Kl @,$D 0 ^*Atmosphere for the past 200 million years:+ 2+  0N0,$D 0 > 20% Oxygen 2   00Rq,$D 0 PSmall amounts of other gases including water vapour, carbon dioxide, noble gasesQ 2Q  0TV,$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@WMZy  !"$%&'()*+,-.0Oh+'0x `h  PowerPoint Presentation John AllenPPaul E Griffithstat6ulMicrosoft PowerPointon@H@fh@ |]ckG`g  (& &&#TNPPT2OMi & TNPP &&TNPP    --- !---&G&w@  ww 0w f^- &Gy& --yH-- @"Arialf :ww 0w f^- .(2 The Earths Atmosphere   &.--0H-- @Times New Romanww 0w f^- . 2 UR . .2 Uv 100s of free   . .2 U>ppts . .2 Ufrom  . .2 ~vwww.pptpoint.com    .--w-- v .2 ~library   .--"System^ f^ !-&TNPP &՜.+,D՜.+,     |On-screen Shown-sy Times New RomanArialDefault DesignThe Earths AtmospherePowerPoint Presentation  Fonts UsedDesign Template Slide Titles 8@ _PID_HLINKSAlhttp://www.pptpoint.com/(_vyPaul E GriffithsPaul E GCurrent User/Priffiths