Old Faithful geyser during one of it’s scheduled eruptions.
Water. Interesting that something so yielding, that can be displaced so easily, can have such force.
Standing at the top of the falls of Yellowstone River where the water pours off the cliff, you can feel the ground shake and the air is thick with noise from the force of the water moving and pounding on the rocks below. And to think that this freezes in the winter, hard to imagine.