UNIVERSE
SOLAR SYSTEM FORMATION
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Question
[CLICK ON ANY CHOICE TO KNOW THE RIGHT ANSWER]
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hydrogen and helium
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oxygen and nitrogen
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carbon dioxide and oxygen
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None of the above
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Detailed explanation-1: -Earth’s original atmosphere was probably just hydrogen and helium, because these were the main gases in the dusty, gassy disk around the Sun from which the planets formed. The Earth and its atmosphere were very hot. Molecules of hydrogen and helium move really fast, especially when warm.
Detailed explanation-2: -Hydrogen and helium were in the Hadean Eon Earth’s early atmosphere was enriched with hydrogen and helium gases. But over time, Earth lost these gases because it wasn’t large enough to hold onto them. Atmospheric composition is related to escape velocity.
Detailed explanation-3: -We think the Earth’s early atmosphere was made up of mostly carbon dioxide, lots of water vapour and very small amounts of methane and ammonia. These gases made it extremely hostile. There was no oxygen, making it similar to the atmosphere of Mars and Venus today.