Submitted by Educational_Dog7430 t3_ymjjdi in askscience
From what I’ve read, Mars and Venus have both been inactive for a while and mercury doesn’t have any mountains or volcanoes.
If the planets gradually coalesced around the same time, why is only earth still volcanically active?
-Hominid- t1_iv593ze wrote
Mars may have had volcanic activity as recently as 50,000 years ago.
https://news.arizona.edu/story/volcanoes-mars-could-be-active-raising-possibility-planet-was-recently-habitable
Venus and Mars lack plate tectonics, which is a huge driver of volcanoes on Earth. Mars is also a lot smaller and has lost more of its internal heat because of this. Venus has more volcanoes than any other planet, but its thick atmosphere and very high surface pressures makes it harder to study for current activity.