posted on Apr, 22 2004 @ 03:50 PM
Volcanoes don't need tectonic movement to blow, although it does help. Volcanoes are simply the mantle of the earth's pressure building up and
blowing off the top of the weakest point in the crust.
However, I've not heard anything about no tectonic activity on Mars. If a planet were to have a liquid core, the crust would be moving. Since the
heat wouldn't be equal everywhere, there would be currents in the magma. This would cause the magma to move against the crust, and away from the
crust, breaking it apart and moving the plates. It wouldn't make sense that a volcano could form with no tectonic activity, at least in my
Now, it may sound like I contradicted myself here, so let me explain why I haven't. A volcano is not dependant on tectonic activity, it's dependant
on a liquid core. However, a liquid core would cause tectonic activity