The Vulcanism of Venus, or the Runaway Greenhouse?

We don't see any plate tatonics on venus. Did did venus's heat shut down its platetonics? Or did its lack of plattetonics drive its heat? Andnd, this is something we don't know. We don't know if it has active ulcanism. What we do know is some horrible point in its past, built up too much heat in its atmosphere,. evaporated all of the water, which became a new greenhouse gas and caused deadly ascitic chemistry to take place. There could still be life on venus in the clouds. Some researchers think the dark patches that get seen in its clouds periodically may actually be the arisilized