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This animation shows middle and high school students how weathering forms sandstone arches. Descriptive text explains that the process begins with a flat, sedimentary surface in which tectonic stress has produced cracks. Weathering widens these cracks, producing thin sandstone walls, and wind-propelled sand drives a hole through the wall. A photograph of an actual arch is provided. Movie controls allow students to repeat, pause, or step through the animation, which can give students more time to read the text and connect it with the images. Copyright 2005 Eisenhower National Clearinghouse
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