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Warm-up Week 16 Day 2

Warm-up Week 16 Day 2. Sedimentary rocks record past geological events and ___. a. changing life forms of the past b. written history c. Earth’s circumference and d. astronomical diameter in the past milestones

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Warm-up Week 16 Day 2

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  1. Warm-up Week 16 Day 2 • Sedimentary rocks record past geological events and ___. a. changing life forms of the past b. written history c. Earth’s circumference and d. astronomical diameter in the past milestones • The dating process that places geologic events in proper sequence is referred to as a ____. a. numerical dating c. relative dating b. temporary dating d. radiometric dating • Index fossils allow geologists to ____. • match rocks of the same b. identify organisms that did age in different regions not leave fossil evidence c. determine rocks’ exact age d. determine why some organisms became extinct

  2. “Radioactive Dating& Geologic Time Scale” 12.3 & 12.4

  3. Review. “Atoms.” Smallest particle of Element.

  4. Center of Atom. P+ No Outside Nucleus. E- Nucleus. “Electron Cloud”

  5. Isotope. • Atom withdiff. #’s P+ and No • Radioactive Decay.

  6. Radioactive Decay • Isotopes  Stable atoms • Parent  Daughter • Release Energy • “Half-Life” • Time for ½ of nucleus stable.

  7. Radiometric Dating • Isotopes decay at constant rate • Calculate “birth” of Parent Isotope • Radiocarbon Dating • Carbon-14 isotope • All living things, from AIR (CO2) • Ratio of Carbon 12: Carbon 14 gives “death” date.

  8. Review: How do we know…? • Relative Dating • Fossils • Radiometric Dating • Radiocarbon Dating So, Now What?...

  9. Geologic Time Scale • Eons • Eras • Periods • Epochs

  10. Evidence Suggests… Early Earth was VERY different from Earth today.

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