Image Credits
Echinus Geyser: Norris Geyser Basin © 2010 Heather Johnson
Abyss Pool: West Thumb Geyser Basin © 2010 Heather Johnson
West Thumb Geyser Basin © 2010 Heather Johnson
Silex Spring: Lower Geyser Basin © 2010 Heather Johnson
Midway Geyser Basin © 2010 Heather Johnson