Answer :
A Terrestrial planet's interior need for it to be a geologically active world because a planet must be large enough to have sufficient radioactive material and it must be large enough to provide some insulation to retain from that heat
The tectonic plates activity on a planet is controlled by the amount of heat that is stored in the interior parts of planets after formation. if there is larger the amount of heat, the more energy stored is transfered to the surface in the form of geological activity.
The Earth and Venus are geologically active worlds with related to thick atmospheres. The Atmosphere are formed and maintained by volcanic outgassing. Terrestrial planets have characteristics like heavy-metal core, at least one moon, and valleys, volcanoes, and craters.
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