I was taught that the miracles all have scientific explanations. The miracle wasn't the events themselves, but that they occurred at the exact right time to be useful. You're free to agree or disagree.
That's a reasonable conjecture.
My biases just tend toward otherwise, much to most of the time.
It's probably safe to say that Moses on the mountains involved some natural lava, fire, brimstone.
But then Scripture characterizes God Himself as causing the mountains to melt. I don't think we know what that means in all cases.