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If outgassing occurred but gravity was insufficient what problem would the secondary atmosphere face?

Answer and explanation

Correct answer: Permanent retention of gases would be difficult

The direct answer is A: permanent retention of gases would be difficult. Outgassing releases gases from Earth’s interior through volcanic and related processes, so it can provide the source of a secondary atmosphere. However, an atmosphere also needs sufficient gravity to hold those gases near the planet. The reasoning is: outgassing supplies gas; gravity prevents gas from escaping into space; if gravity is too weak, released gases gradually escape; therefore the secondary atmosphere cannot be retained permanently. Option A is correct. Option B is wrong because water vapour cannot simply turn into metal because of weak gravity; phase changes and chemical changes are different ideas. Option C is wrong because weak gravity would not make the core disappear. Option D is wrong because ozone does not form immediately: it requires oxygen and suitable atmospheric conditions, and weak gravity would make retention difficult. Do not confuse atmosphere formation with atmosphere preservation. Memory cue: source plus holding power—outgassing gives the first, gravity gives the second.

Related tags

OutgassingGravityAtmosphere Retention

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