We like to think of land as a fairly static thing, considering that's where we spend the majority of our lives.
And to think that the ground is ever-changing, well, that's a bit unsettling. But the reality is land is always changing — perhaps nowhere more so than at the Kumani Bank mud volcano, also known as Chigil-Deniz, some 15 miles (25 km) off the coast of Azerbaijan in the Caspian Sea.
