The Cenozoic Era
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Rocks
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Geochronology, Dating, and...
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Rats, Bats, and Xenarthrans
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Landforms
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The Paleozoic Era
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Climate and Climate Change
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Plate Tectonics, Volcanoes,...
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Glaciers, Sea Ice, and Ice...
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The Mesozoic Era
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Minerals
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Storms, Violent Winds, and...
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Reptiles and Amphibians
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Biomes and Ecosystems
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Grazers
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Primates
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New Thinking about Evolution
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Carnivores
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Forests and Grasslands
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Rivers and Streams
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Meat Eaters
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