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The number of thermal features in Yellowstone is estimated at 10,000[1] and 200 to 250 geysers erupt in Yellowstone each year, making it the place with the highest concentration of active geysers in the world,[2] thanks to its location in an ancient active caldera. Many of these features build up sinter, geyserite, or travertine deposits around and within them.
When properly confined and close to the surface it can periodically release some of the built-up pressure in eruptions of hot water and steam that can reach up to 390 feet (120 m) into the air (see Steamboat Geyser, the world’s tallest geyser).[3] Water erupting from Yellowstone's geysers is superheated above that boiling point to an average of 204 °F (95.5 °C) as it leaves the vent. The water cools significantly while airborne and is no longer scalding hot by the time it strikes the ground, nearby boardwalks, or even spectators.
reply to post by Bennogob
I think these are "surveillance" droids controlled by scientists in order to check the activity and taking measures in total security for human beings...