Mystery #3Tier 2earth / mountains
How do towering mountains rise up from flat ground?
Some mountains are so tall their peaks poke above the clouds, with snow on top even in summer. Yet the ground they stand on was not always sky-high. Something lifted all that solid rock up towards the heavens. So how does ordinary flat ground heave itself up into a towering mountain?

Your guess
What's your best guess for how a mountain gets pushed so high?
There's no single magic word to type, have a go in your own words, then reveal the answer to see how close you got.
Make a guess to unlock the hints and the answer.