image credit: Jim Gordon (Creative Commons); image source; larger image.
The Mystery of the Racing Rocks
What could cause rocks like this--of various sizes--to slide across the desert of Death Valley and leave these long tracks? The force of the wind... the force of moving ice sheets? To find out about these possibilities, visit The Mystery of the Racing Rocks.
Also check out The Sliding Tracks of Racetrack Playa for other explanations and more images.
(This feature was updated on 1/24/2013.)
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Investigation 4 - Erosion
Try Investigation 4 - Erosion for a hands-on simulation of erosion to learn how wind and water change the land. For more information and photographs, see this Kansas State University webpage.