Hydrothermal activity[edit]

Geothermal heat and groundwater can interact in several ways. The most well known of these is geysers, which happens when groundwater in underground cavities becomes superheated under a lid of colder surface water. When the superheated water breaches the surface, it flashes to steam, causing the pressure below it to suddenly drop, which causes a chain reaction where most of the water in the geyser's feed system flashes to steam all at once. In other areas, the heated groundwater gathers in pools, forming hot springs. A third phenomenon is where the heated groundwater brings mud up with it as it travels towards the surface, forming mud volcano's User:Licks-rocks/sandbox/Tektonic zones of pakistan

User:Licks-rocks/sandbox/Giant current ripples

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