Geysers are bursts of boiling hot water that erupt from below the surface into the air, often several hundred feet.
A fumarole is a steam vent.
The steam comes from hot springs below the Earth’s surface that are so hot that their water boils away before they reach the surface.
A mudpot looks like it sounds, a hot, bubbling mound of clay and sand mixed with a little water.
It smells like rotten eggs because it contains sulfuric acid.
Hot springs occur when water below the Earth’s surface passes across hot rocks in areas of recent , geologically speaking, volcanic activity and then flows to the surface of the Earth.