CK-12 Foundation
Ck 12: Earth Science: Plate Tectonics Through Earth History Study Guide
[Free Registration/Login may be required to access all resource tools.] Summarizes the key points about the movement of tectonic plates throughout Earth's history. Includes a few questions to check for understanding.
CK-12 Foundation
Ck 12: Earth Science: Earth History and Clues From Fossils
How scientists can learn information about the past from fossils. [Free Registration/Login may be required to access all resource tools.]
American Museum of Natural History
American Museum of Natural History: O Logy: If Rocks Could Talk: Limestone
A simple explanation of how limestone rock is formed.
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