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Earth ScienceOrigins of Plate Tectonic Theory
The theory of continental drift was the first step toward plate tectonic theory, which became...
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BiologyOrigins of Life I
Since prehistoric times, people have pondered how life came to exist. This module describes investigations...
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Earth ScienceWeather, Fronts, and Forecasts
Before you go out for the day, you probably check the weather to help determine...
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