What Are Hot Water Geysers?
A geyser is a hot water spring which shoots big streams of water into the air through a hole. The hole called a tube goes down to the underground reservoirs which are the storage basins for hot water.
The water that goes down inside the earth is the rain or snow water. Deep inside, the earth is very hot. In some places the gases from the hot rocks, mostly steam, rise through cracks in the rock and reach the underground reservoirs. The water stored there is heated to high temperatures. This makes a hot spring.
When in a hot spring the steam and water can come to the surface without any interference, the spring remains steady. But if the water and steam are unable to find an easy way out, the water system is heated to the boiling point and turns into steam. Steam requires more room than the water which makes it and so it pushes the column of water above it. When the steam moves up, the pressure below it is lowered, and turns more water into steam. Due to the excess push, there is a violent eruption of the steam from a point where the crust of the earth is weak. This beautiful sight of the steam and hot water gushing upwards is what is called a geyser.