Photographs of Upper Geyser Basin, Yellowstone National Park


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Water in Sponge Geyser
Previous PhotoBoiling water in the elevated vent of Sponge GeyserNext Photo

The water in Sponge Geyser often completely fills the raised cone, which is formed of grey-brown sinter with an uneven surface, resembling a sponge. Like Pump Geyser on the opposite side of the trail, Sponge Geyser is generally very active, throwing water 1 or 2 feet in the air over a period of up to one minute, with a similar interval between eruptions. In recent years the spring has become less spectacular, however, the water rising and falling but not being ejected. The large cone partly obscures two other small geysers behind, Plate and Slot.

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Keywords: Yellowstone National Park, Upper Geyser Basin, Wyoming, thermal features, geysers, hot springs, hot pools, boiling water
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