Hydrothermal Vents prove that we only live on a very small layer of Earth. That at the depths that they are located, they are so close to the center of magma, whether there is a volcano or not, that they are able to produce unimagineable heat! And what is even more unique about the vents is that they provide a healthy environment for lots of underwater organisms that where believed to be unable to live at such depths.
I hope that helps!
