The warmth of the volcanically heated water running down from the Grand Prismatic Spring area fosters the growth of multi-colored bacteria that thrive on the heat and moisture.
Near-boiling water gurgles down the rocks alongside the Grand Prismatic Spring area, giving life to a rainbow of bacteria and filling the air with thick steam.
Many of the hot springs in Yellowstone are rainbows of blue, yellow, orange, and red bacteria that thrive on the heat and moisture of the near-boiling volcanic waters.
