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📘 How a geyser erupts

See how geothermal heat, narrow plumbing, pressure, and flashing steam create a geyser cycle.

lessons

~10 min

to learn

🔬 Science

subject

Adults

level

Start the course →

What you’ll learn

Heat below
The plumbing
Superheating
First release
Jet and column
The recharge phase
Silica and cones
Why intervals vary
Old Faithful
Safety and science

Questions this course answers

Why can deep geyser water be hotter than surface boiling water without boiling?

The weight of the overlying water increases pressure and raises the boiling point.

What makes a geyser different from an ordinary hot spring?

Geyser plumbing allows pressure and superheated water to build before discharge.

What drives the eruptive jet?

A pressure drop lets water become steam, whose expansion pushes the remaining water upward.

Why can eruption intervals change?

Natural and human changes can alter water supply, conduit shape, or pressure.

Why are geyser boardwalks important?

Boardwalks keep people on stable routes away from dangerous hot water and fragile crust.

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