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This National Park Service (NPS) educational site provides a slide show for middle school students which discusses the forces that shape the Earth, and the theory that explains how our planet has changed over billions of years: plate tectonics. This show demonstrates how this theory works to explain phenomena such as earthquakes and volcanoes, and how fossils help provide evidence for this theory. By indicating climatic changes as well as physical changes over millions of years, fossils support the theory of plate tectonics and provide clues to ancient environments. This show uses National Parks as examples for this, and emphasizes their importance in preserving and protecting the fossils from human influence.
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