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♨️ How geysers work

Follow heat, groundwater, pressure, steam, and underground plumbing through the repeating cycle that makes a geyser erupt.

4
lessons
~20 min
to learn
Adults
level
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What you’ll learn

  1. The ingredientsIdentify the heat, water, and plumbing conditions that make a geyser possible.Geysers need an underground arrangement that stores hot water under pressure.
  2. From pressure to eruptionExplain how pressure, superheating, flashing, and steam expansion produce an eruption.A pressure drop triggers expanding steam and turns stored heat into a surface jet.
  3. The resetDescribe how eruption, recharge, mineral deposition, and changing flow paths shape the next cycle.An eruption drains the system while groundwater, heat, and minerals reshape recovery.
  4. Reading a geyserDistinguish natural predictability from exact clockwork and connect observations to causes.Geysers can be monitored and forecast, but their rhythm remains geological.

Questions this course answers

Which three ingredients make a geyser possible?

A geyser requires geothermal heat, groundwater, and underground geometry that can store and release pressure.

Why can deep water remain liquid above 100 degrees Celsius?

Higher pressure raises the temperature at which water begins to boil.

What starts the self-reinforcing part of an eruption?

Steam expansion lowers pressure and drives more water out, allowing further flashing below.

What happens after an eruption?

Groundwater and heat rebuild the conditions for the next eruption after the reservoir drains.

What does Old Faithful's predictability mean?

Old Faithful is comparatively regular, but natural changes keep each interval variable.

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