photo credit: Philip Greenspun; image source

Sand Dunes

This photo (hi-res version) shows the Great Sand Dunes National Monument in Mosca, Colorado. To learn more about sand dunes, visit this Wikipedia entry.  Also, to see sand dunes form indoors, check out this Exploratorium exhibit.

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PhET: The Moving Man

If you'd like to learn about motion, try PhET: The Moving Man, a PhET simulation from the University of Colorado. As you move the man back and forth, the applet generates graphs of position, velocity, and acceleration. There are nice sound effects, too.

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image credit: U. S. Geological Survey; image source

Sand Dunes in Namib Desert

This Landsat-7 image (hi-res version) shows the world's tallest sand dunes. For a satellite image of sand dunes advancing on a city, see NASA's City-Swallowing Sand Dunes.

Physics in Action: Whole Grains

Visit Physics in Action: Whole Grains to learn about physics research in granular materials.   You'll see a photo of a collapsing grain silo and a terrific sand castle.   For more, see the NASA site The Physics of Sand Castles.