Visitors to Yellowstone National Park stroll along a boardwalk near the edge of Grand Prismatic Spring. At the centre of the pool the temperature is 93 degrees C, and the water cools as it nears the edges of the pool. The different colours are caused by bacteria which live in different temperatures of water.
Visitors to Yellowstone National Park stroll along a boardwalk near the edge of Grand Prismatic Spring. At the centre of the pool the temperature is 93 degrees C, and the water cools as it nears the edges of the pool. The different colours are caused by bacteria which live in different temperatures of water.
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