Write an account of the orignal atmosphere on primative earth?
class 12th CBSE Biology sample paper
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Earth's early atmosphere contained no oxygen. ... constituent of the Earth's atmosphere, accounting for approximately 78 percent of the gases. CBSE Class 12 Sample Question Papers & Question Bank with Solutions for March 2016-2017 * Class 12 Contains - Physics, Maths, Chemistry ...
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The original atmosphere on earth was very different from that existing at present .
It probably contained hydrogen, nitrogen, carbon-dioxide and water vapours derived from the cosmic cloud.
As the atmosphere and earth cooled ,much of water vapours condensed into droplets and came down as rain on earth.
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the gases ( H2 , N2, CO2 etc.) intracts with each other and with carbon , sulphur , nitrite the crust of earth were formed , producing methane, ammonia, hydrogen cyanide.
There were No O2 in the primitive atmosphere.
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