• An aerial view of Old Faithful erupting taken from Observation Point with the Old Faithful Inn to the side.

    Yellowstone

    National Park ID,MT,WY

Emerald Spring

Bubbles rise to the surface, and steam from the surface, of this brighly green-colored hot spring pool.
 

A hot spring's color often indicates the presence of minerals. In a clear blue pool, the water is absorbing all colors of sunlight except one, blue, which is reflected back to our eyes. Here in Emerald Spring's pool, another factor joins with light refraction to give this spring its color. The 27-foot (8 meter) deep pool is lined with yellow sulfur deposits. The yellow color from the sulfur combines with the reflected blue light, making the hot spring appear a magnificent emerald green.

Hot spring water can dissolve and transport sulfur from underground. The mineral can deposit and crystallize at the earth's surface, sometimes in hot spring pools.


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Did You Know?

Dog Hooked to Travois for Transporting Goods.

Some groups of Shoshone Indians, who adapted to a mountain existence, chose not to acquire the horse. These included the Sheep Eaters, or Tukudika, who used dogs to transport food, hides, and other provisions. The Sheep Eaters lived in many locations in Yellowstone.