White Dome Geyser
White Dome Geyser erupts on an irregular schedule, approximately every 10 to 60 minutes, and reaches heights of 20 to 30 feet. The cone is over 10 feet high, but the opening of the geyser is only a few inches wide. As minerals build up on the outside, raising the cone, they also line the inside of the geyser, reducing the width of its orifice. It is possible that in time the cone will seal itself and White Dome will go dormant.
We were fortunate to be able to wait for this geyser to erupt -- and I was fortunate to be able to photograph it near that perfectly-placed little puffy cloud. :)