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.

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Presentation transcript:

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

“Radioactive Dating & Geologic Time Scale” 12.3 & 12.4

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

Isotope. Atom with diff. #’s P+ and No Radioactive Decay.

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

Radiometric Dating Radiocarbon Dating Isotopes decay at constant rate Calculate “birth” of Parent Isotope Radiocarbon Dating Carbon-14 isotope All living things Ratio of Carbon 12: Carbon 14 gives “death” date.

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

Geologic Time Scale Eons Eras Periods Epochs

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