Yous can see four things unique to Yellowstone from this photo: The bacterial mat i(gold) in the front, the steaming giant hot spring (blue) in the middle, the burned trees from the famous Yellowstone fire on the hill and blue sky in the back.
Canon EOS 20D
,Tamron SP 17-35 mm F2.8-4 w polarizer 1/320s f/9.0 at 17.0mm iso400
full exif