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geologic time scale: summary of major events of the Earth’s history preserved in the rock record •the history of the Earth is divided by major changes in the Earth’s surface, climate and/or species Eons: largest segment of time; (100s of millions-billions of years) 1. Archean 2. Proterozoic 3. Phanerozoic Eons are divided into Eras Eras are divided into Periods Periods divided into Epochs theory of evolution: theory that organisms change over time and new organisms are derived from ancestral types •theory proposed by Charles Darwin