Botryoidal Spring is a geyser

Geyser

A geyser is a spring characterized by intermittent discharge of water ejected turbulently and accompanied by a vapour phase . The word geyser comes from Geysir, the name of an erupting spring at Haukadalur, Iceland; that name, in turn, comes from the Icelandic verb geysa, "to gush", the verb...

 in the Lower Geyser Basin of Yellowstone National Park

Yellowstone National Park

Yellowstone National Park, established by the U.S. Congress and signed into law by President Ulysses S. Grant on March 1, 1872, is a national park located primarily in the U.S. state of Wyoming, although it also extends into Montana and Idaho...

 in the United States

United States

The United States of America is a federal constitutional republic comprising fifty states and a federal district...

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Botryoidal Spring is part of the White Creek Group which includes A-0 Geyser

A-0 Geyser

A-0 Geyser is a geyser in the Lower Geyser Basin of Yellowstone National Park in the United States.A-0 Geyser is part of the White Creek Group which includes Spindle Geyser and Botryoidal Spring...

 and Spindle Geyser

Spindle Geyser

Spindle Geyser is a geyser in the Lower Geyser Basin of Yellowstone National Park in the U.S. state of Wyoming.Spindle Geyser is part of the White Creek Group which includes A-0 Geyser and Botryoidal Spring...

. As its name indicates, Botryoidal Spring was formerly a hot spring. In 1996, seismic activity caused to change from a bubbling spring into an explosive geyser.

It erupts for a duration of about one minute with an interval of around 3–5 minutes between eruptions. The fountain reaches a height of 10 feet (3 m).

Immediately after an eruption the pool is totally quiet. An eruption starts with no warning, most beginning with a blue bubble caused by immense steam bubbles forming below.