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View Resource Earthquakes and Volcanoes

This unit provides an introduction for younger students on earthquakes, volcanoes, and how they are related. Topics include evidence of continental drift, types of plate boundaries, types of seismic waves, and how to calculate the distance to the epicenter of an earthquake. There is also information on how earthquake magnitude and intensity are measured, and how seismic waves can reveal the...

View Resource Plate Tectonics: The Scientist Behind the Theory

The scientific community does not always embrace every new idea that comes along. Alfred Wegener, the scientist who first proposed the theory of continental drift, learned that the hard way. This video segment shows how Wegner developed his theory by using multiple lines of evidence, and chronicles the less-than-enthusiastic reponse of the geologic community in the early twentieth century. It...

View Resource Plate Tectonics: Further Evidence

Early evidence showing striking similarities between regions on opposite sides of vast oceans suggested that in Earth's distant past what are now separate continents may once have been connected. However, this evidence said nothing about how the continents could have moved to their present positions. This video shows how seafloor spreading creates new oceanic crust and how the crust is destroyed...

View Resource The Great Continental Drift Mystery

This unit introduces students to the development of the theory of continental drift. They will examine the early work of Alfred Wegener and Alexander DuToit, investigate lines of evidence that resulted in the development of the theory, and learn about the final lines of evidence that resulted in the theory's acceptance. There is a set of activities in which the students construct a map of Pangea...

View Resource Plate Tectonics: Earthquake Epicenter

This lesson provides an overview of destructive earthquakes and their connection to tectonic movements of the Earth's crust. It includes a discussion of some especially destructive historic earthquakes, and a brief introduction to continental drift and the theory of plate tectonics. There is also discussion of basic seismology (types of waves) and measures of the magnitude of an earthquake (the...

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