This is my report writing on geysers. By Cyprus.

A geyser is a phenomenon that squirts hot water like volcano. The geyser is mostly from Rotorua they have a lot of geysers at Rotorua. A geyser is like a volcano shape but its underground. A geyser needs a water source, usually from miles under the Earth's surface.

The geyser also needs a heat source, supplied by the Earth's magma, about 3 miles (4.8 kilometers) under the surface of the Earth.  The magma heats the water, but hot water isn't enough,  another key factor is pressure. The water at the top of the geyser puts pressure on the water at the bottom of geyser shaft.

For geyser to occur there must be heat, water, and a plumbing system. A magma chamber provides the heat, which radiates into surrounding rock. Water from rain and snow works its way underground through fractures in the rock.

As the water reaches hot rock it begins to rise back to the surface, passing through, which is former volcanic ash or lava rich in silica. The hot water dissolves the silica and carries it upward to line rock crevices. This forms a constriction that holds in the mounting pressure, creating a geyser's plumbing system. Did you know that when a geyser erupts the pressure makes it erupt because the water in the geyser is too hot and it creates bubbles, and thats how the geyser erupts, the pressure from the geyser .