Mammoth Hot Springs, Yellowstone National Park, caused by the volcanic activity deep below the earth. 
Like Old Faithful, these terraces are constantly changing as a result of the heat (from a partially molten magma chamber), water and limestone. 

Mammoth Hot Springs, Yellowstone National Park, caused by the volcanic activity deep below the earth.

Like Old Faithful, these terraces are constantly changing as a result of the heat (from a partially molten magma chamber), water and limestone.