Geysers can remain dormant for years before erupting again.
Geysers require an unusually precise combination of heat, water, and rock.
Geysers can stop erupting after earthquakes.
Old Faithful stays faithful partly because it has little competition.
Geysers can hold water hotter than boiling.
Geysers may spend years underground preparing for an eruption lasting minutes.
Earthquakes can change a geyser's schedule.
Geysers helped scientists understand how pressure affects boiling water.
Yellowstone holds the world's greatest collection of geysers.
Geysers are far rarer than hot springs.
Geysers hide complex plumbing underground.
Some geyser water began as centuries-old snow.
Geysers are rare geological lottery winners.
Geysers explode when trapped water flashes into steam.
Geysers can change their eruption schedule without warning.
Geysers can erupt higher than a ten-story building.
Geysers exist in only a handful of major regions worldwide.
Geysers can launch thousands of gallons in minutes.
Geysers are powered by the same forces that drive volcanoes.
Geysers can erupt with water hotter than your kitchen kettle.