What conditions are needed for a geyser to form?

For a geyser to form, specific geological conditions are required: there must be a heat source, typically magma or hot rock, that heats groundwater. This groundwater needs to be trapped in a reservoir, often located beneath a layer of impermeable rock, allowing pressure to build. When the pressure exceeds the strength of the overlying rock, the superheated water erupts to the surface in a dramatic display of steam and water. Additionally, a system of fractures or conduits is essential for the eruption to occur.