GK
SOLAR SYSTEM
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Question
[CLICK ON ANY CHOICE TO KNOW THE RIGHT ANSWER]
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Oxygen
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Nitrogen
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Ozone
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Argon
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Detailed explanation-1: -Oxygen was absent in early earth atmosphere.
Detailed explanation-2: -Scientists broadly agree that Earth’s early atmosphere and oceans were all but devoid of oxygen gas. But there are signs that there was some oxygen around. Geochemists, for example, have found mineral deposits dated to about 3 billion years ago that they argue could only have formed in the presence of oxygen.
Detailed explanation-3: -Hence, oxygen was absent during the formation of earth. So, the correct answer is ‘Oxygen gas’.
Detailed explanation-4: -(4.6 billion years ago) As Earth cooled, an atmosphere formed mainly from gases spewed from volcanoes. It included hydrogen sulfide, methane, and ten to 200 times as much carbon dioxide as today’s atmosphere.