Geyser
A geyser was a geological feature that emitted hot liquid or steam into the air.

Old Faithful on Earth was a geyser that had eruption cycles every 65-92 minutes. ()

The planet Melnos IV had a notable plasma geyser. Nella Daren led a team of geologists to study it sometime before 2369, when she recalled their modification of some thermal deflector units to protect themselves from the . ()

See also 
 Hot spring

External link 
 
Geology