Hot lava is called lava when it gets out of the Earth. When it is still inside and under the ground it is called magma.
Magma heats up the water and earthquakes help the ground crack and the hot water or hot mud get out.
Sometimes the hot water just bubbles and sometimes it squirts water out very high. Other cracks or holes in the rocks let just steam out.
Bacteria (germs) and minerals (kind of like vitamins) can make the hot water turn different colors. Some are so beautiful. I wanted to touch them but I know that is not allowed. It could make a problem in the colors or maybe be hot enough to burn me.
