Based on all we know about the terrestrial worlds, what single factor appears to play the most important role in a terrestrial planet's geological destiny?

Question

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The size of a terrestrial planet is the most crucial factor in determining its geological destiny because it affects its ability to retain heat and sustain geological activity over time. Larger planets cool more slowly and can maintain tectonic and volcanic activity longer than smaller ones.

Based on All We Know About the Terrestrial Worlds, What