Billions of years ago Mars was able to have highly explosive volcanism
and it's not just a one-off but we had many episodes of highly explosive volcanism
in a sort of short geologic window
Two folks found these things that look like impact craters in Arabia Terra
but they're missing some features and they have some different features that
actually make them look more like volcanic caldera formed from explosions
On Earth we can't actually see this far in the past in many places because we
have erosion on Earth so we don't have access to a great geologic record for
three billion years ago on Earth. On Mars, we can see that
We're trying to understand just how large explosions
or large lava flows on places like Earth but also other planets might affect the climate
So we know from just the last century that very large volcanoes do have a climate impact
This tells us something really important about the history of Mars
and in turn the history of just planets in the solar system