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The top documents tagged [periods eras]
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Stone Age – the longest human age, probably began around 2.5 million years ago. - Humans used stones as tools. Stone Age – the longest human age, probably
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Chapter 3 Time and Geology. Geochronology The science that deals with determining the ages of rocks is called geochronology
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Chapter 17: The History of Life Calif. Science standards 8e
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Technology
Geologic time
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Life and Geologic Time. Geologic Time The appearance and disappearance of types of organisms throughout Earth’s history give scientists data to mark important
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The Geologic Time Scale Earth’s History. The geologic time scale divides Earth’s long history into units of time… Eras Periods Epochs Eras are divided
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Theory of Evolution. WRITE A DEFINITION: gradual change over time; the process by which modern organisms have descended from ancient organisms a well-supported
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The Origin of Life
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