Understanding Our Earth: How Its Surface Change
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✎ Suggest a correctionExplains the slow but constant change in the surface of the earth by showing the erosive effects of water and wind upon a recently excavated mound of raw earth. Includes scenes of the eruption of the Paracutin Volcano, the Grand Canyon of the Colorado River, and a rocky mountainside, pointing out the geologic evidence of forces which continue to build up and wear away the surface of the earth. Educational collaborator: Glenn O. Blough
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