Are Volcanoes Important?

The size of a planet determines like how hot it gets, how much gravity there is and also how long it takes to cool. mars is much smaller than earth, which is probably why it's cooled faster. And the outer crust has formed and been so thick and choked off all those volcanoes. You need volcanoes to make an atmosphere. E, you don't just get it for free. Like if there was gas around when the earth formed, and mostly got blown off because you have, like, the steady currents. So by the time things settled down and cooled off, then you need to sort of replenish it in the same way as we did with water. That mostly came