What are smokers?

What are smokers?

Deep down in the ocean, scalding water from the Earth’s red hot interior, gushes out of cracks in the sea bed. The water contains chemicals which settle on the ocean floor to build tall structures that are called chimneys, because they look like chimney stacks. The chemicals in the boiling water that is gushing out, also makes the water turn black, so that it looks like smoke billowing out of a chimney. These chimneys are also called smokers.