This pictures are taken from Great Sand Dunes in Mosca, Colorado.
This sand dunes can tell you how nature are so wonderful and marvelous.
Everyone thinks that how sand dunes were formed next to mountains.
The reason is Hydrology. There are underground creeks under the sand
dunes, so the sand dunes are kind of floating on the water.
This sites will tell you more about Great Sand Dunes.
History: http://www.nps.gov/grsa/historyculture/index.htm
Form: http://www.nps.gov/grsa/naturescience/hydrology.htm
Great sand dunes visitor guide 2010-11
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