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Science -- Instructional issues
736 - 740
Koppen Classification Flow Chart
This flow chart presents the climate classification system developed in the early 1900s by German climatologist and amateur botanist Wladimir Koppen. The system establishes six climate zones (denoted by letters)...
Glaciers are found on every continent except Australia. This interactive feature provides an introduction to these moving streams of ice, which cover about 10 percent of Earth's land surface and hold between two and...
The Frog Man of the Sonoran Desert
This radio broadcast features an interview with a herpetologist who studies the native toads of the Sonoran Desert and an invasive species from the east, the American bull frog. The herpetologist, Dr. Cecil Schwalbe,...
Interviews: Taking a Tally of the Siberian Tiger
This radio broadcast features an interview with a wildlife conservationist who recently conducted a count to determine the population size of the Siberian tiger. The results were something of a surprise: instead of a...
Earthquakes and Plate Tectonics
This article describes the theory of plate tectonics and its relation to earthquakes and seismic zones. Materials include an overview of plate tectonics, a description of Earth's crustal plates and their motions, and...
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