Geyser is a working model of a natural geyser. A large bowl of water is supported over a long, thin tube which runs down to a glass chamber filled with water heated by a heating element. As the water in the chamber begins to boil, air and water are shot up the tube into the air. Cool water drains back down the pipe filling the chamber, and the cycle begins again. At the Exploratorium, Geysers of different heights (and, therefore, different cycle times) are placed together.