As we got closer to Old Faithful, we saw steam rising in the distance. Shown above, the Lower Geyser Basin has hot springs and geysers.
Carbon dioxide bubbles to the surface of this hot water pool. The pool appears to have blue water, but the park service provides this explanation. When sunlight shines into the clear, deep water of the pool, the blue light is scattered the most, causing the water to appear to be blue. The shore around the pool isn’t blue, indicating there’s nothing blue in the water.
Viewed from above, this pool is blue where it’s deepest. Something white accumulating is accumulating along the edges of the pool.
Seen below, heat-loving microorganisms consume some of the gases and help convert them to sulphuric acid. The acid breaks down the rock to form clay — clay that mixes with water in mudpots.
The Midway Geyser Basin has larger pools. See the people in the background.
Water-filled terraces formed by minerals in the water make an abstract image. The rising steam obscures the wooded hill in the background.
Random terraces shot from a low angle form an abstract image.
The Grand Prismatic Spring is a hot spring 200 feet wide with varying colors shown in the rising steam. The blue steam is from the deep water in the center of the pool. Cooler water around the edge of the pool supports organisms with yellow, orange and brown colors.
Finally, this hot spring at the Black Sand Basin shows vivid colors around the edge.