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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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Earth ScienceThe Hydrologic Cycle
Powered by the sun, water constantly cycles through the Earth and its atmosphere. This module...
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Earth ScienceEarth Structure
Earth's interior structure is composed of layers that vary by composition and behavior. Using principles...
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