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History of the Earth

History of the Earth. Ch. 32. What Important Historical Events can you name and date?. Dinosaurs Oldest Living Organism Oldest Rock Age of the Earth. Timelines…. Experiencing Geologic Time:. How long would it take to count to a million? (1,000,000)

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History of the Earth

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  1. History of the Earth Ch. 32

  2. What Important Historical Events can you name and date? • Dinosaurs • Oldest Living Organism • Oldest Rock • Age of the Earth

  3. Timelines…

  4. Experiencing Geologic Time: • How long would it take to count to a million? (1,000,000) 1,000,000 “yrs” 1 sec 1 min 1 hr 1 day = 5.8 ≈ 6 days! “yrs” 60 sec 60 min 24 hr A thousand millions is a “billion” • How many years would it take to count to a billion? (1,000,000,000) (Show the calculation for extra credit)

  5. Geologic Time at Scale:visualizing 544 my 5000 my ~ 12% of Earth History

  6. The “ages” of Geologic Time Hadean, Archaen and Proterozoic Eons (the first 4.1 billion years) Phanerozoic Eon (the last 500 million years) Look at page 600 in your Textbook

  7. Investigating Geologic Time Relative Time • Index fossils • Stratigraphy • Law of superposition • Unconformities Absolute Time • Tree Rings • Sediment Layers (varves) • Radioactive decay Microfossils, Sediments and Sea Floor Spreading Stratigraphy Exercises Radioactive Decay Problems Chapter 32 Section I, II and III

  8. Video Preview of Ch. 32 Video Assignment • Geologic Time • Life in Earth’s Past • Events in Earth’s Past

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