Why did the hot water rise above the black smoker?
Water, like all substances, is made from very tiny particles which can only be seen by very powerful electron microscopes. When the water receives heat, the particles move further apart from each other. This makes the water lighter in weight than the surrounding cold water. When any substance is lighter in weight than the water around it, the substance floats. Think of a cork. It is much lighter in weight than water. If you hold a cork under water then let it go, it pops up quickly. In a similar way, the hot water from the black smoker rises up into the ocean.
