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This animation demonstrates the development of an angular unconformity to high school Earth science students. The introduction defines an unconformity as a gap in sedimentary rock. The animation shows how the cycle of sedimentation and erosion can be interrupted by intrusion of igneous rock. Mountain-building then tilts the rock layers, causing uneven erosion, which leaves pockets of material that are covered by newer sediments. Movie controls allow students to repeat, pause, or step through the animation, giving students more time to analyze the images. Copyright 2005 Eisenhower National Clearinghouse
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