Sand Hills [Sand
are actually sand dunes [Dunes]
left over from the end of the Ice Age about 10,000 years ago [Ice Age].
Some of the dunes are over 300 feet tall (100m) and together occupy a
quarter of the State of Nebraska [NASA
These dunes are dormant, but were active as recently as 600 years ago [Ground
Images]. This view is
looking east from
38,000 feet, about 300 miles northeast of Denver, at position N42, W101.[map].
Olympus c70zoom. 7 Aug 2007
2007 Brian Whittaker (.com)