What is geyser and what causes it

What is geyser?:

A geyser is a hot spring that erupts periodically like a volcano of hot steam and water. The name geyser originates fromIcelandic and means “to gush.” Geysers are named after the “Geysir” at Haukadalur, Iceland. There are two kinds of geysers: cone geysers and fountain geysers. Cone geysers erupt from mounds of geyserite while fountain geysers are those that erupt from pools of water.

What causes geyser?:

A geyser is caused by water on the surface of the Earth seeping down toward the center of the Earth where it contacts magma-heated rock that causes it to boil and erupt back up to the Earth’s surface by the process of convection. A tremendouscolumn of a geyser eruption is often the result of the process which repeats itself over and over again through the geyser’s vent
-Maydelene (19)