science report

1. Atmosphericcompositionandorigins
At Earth’ssurface,the atmosphere consistsof 78% nitrogen,21% oxygen,and1% argonwithtraces of
watervapor,carbon dioxide andothergases.
To estimate howmuchwatervaporwouldbe releasednote thatthere isenoughwatertocoverthe
entire earthtoa depthof about300 meters.
On a warmerEarth’s,anothersource of additional atmosphere wouldbe foundinthe sedimentary
carbonate rocks of the crust.