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What effect does size have on geological activity in rocky planets?

Answer and explanation

Correct answer: Larger planets retain internal heat for longer and can therefore remain geologically active for longer

A larger rocky planet has a lower surface-area-to-volume ratio, so it loses internal heat to space more slowly. This retained heat can power mantle convection, volcanism, and tectonic processes for a longer period. Smaller planets, such as Mars, tend to cool more quickly and may become less geologically active. Option B is incorrect because size is important but does not make smaller planets “always” more active. Exam tip: link larger planetary size with slower heat loss and longer geological activity.

Related tags

Rocky PlanetsGeological ActivityInternal HeatPlanetary CoolingPlanet FormationStar FormationFormation Of PlanetsAnd Our Solar SystemStar Formation Formation Of Planets And Our Solar SystemThe Origin And Evolution Of The Earth

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