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Removal of hydrogen and helium most strongly supports which analysis?

Answer and explanation

Correct answer: The first atmosphere was light and unstable

Hydrogen and helium are the lightest gases. In the early stage of Earth’s development, the planet’s gravity and temperature conditions were not sufficient to retain large amounts of these very light gases, and solar wind could strip them away. Their removal therefore supports the conclusion that the earliest atmosphere was light and unstable rather than a durable atmosphere like the present one. Option D is correct. Option A contradicts the evidence because hydrogen and helium are not heavy gases. Option B incorrectly assumes early atmospheric stability, while option C concerns ocean formation and cannot be directly inferred from the loss of these gases.

Related tags

Earth-EvolutionHydrogenHeliumEarly-AtmosphereEvolution Of The EarthThe Origin And Evolution Of The EarthGeographyClass 11 Mcq

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