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Corkee t1_j29i3ti wrote

Reply to comment by ackillesBAC in How much does the liquid magma of the Earth affect it's surface temperature? by tripperfunster

An active core will release gasses to be accumulated on the surface of the planet through tectonic activity and volcanism. It will also generate a magnetosphere under the right conditions, which again shield those gasses from being blown away by stellar winds - but this is a very minor factor compared to the venting of gasses from an active core.

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ackillesBAC t1_j29tzon wrote

That makes sense, since captured gas would basically be mostly be hydrogen, other vital gases would have to come from solids or gases trapped in the solids that created the planet, which will need an active core and volcanism to release.

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