OLD FAITHFUL, WY - - Geothermal art comes in many forms, like the geyser at top (a repeat pic), or the gold colors in the middle shot to the paw print (probably wolf) which is 200-300 years old given the depth of the impression. The colors come from the water temperature. Lighter, more brilliant golds on the geyser signal that the water temp is in the 190-degree range. The two other pics probable temperatures are in the 160 to 140-degree range given the darker hues.
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