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Billions of years ago Mars was able to
have highly explosive volcanism

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and it's not just a one-off but we had many
episodes of highly explosive volcanism

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in a sort of short geologic window

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Two folks found these things that look
like impact craters in Arabia Terra

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but they're missing some features and they
have some different features that

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actually make them look more like
volcanic caldera formed from explosions

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On Earth we can't actually see this far
in the past in many places because we

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have erosion on Earth so we don't have
access to a great geologic record for

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three billion years ago on Earth.
On Mars, we can see that 

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We're trying to understand
just how large explosions 

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or large lava flows on places like Earth but also
other planets might affect the climate

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So we know from just the last century that very 
 large volcanoes do have a climate impact

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This tells us something really important
about the history of Mars

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and in turn the history of just planets in the solar system