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Geologic Time

Geologic Time. Learning Goal. Learn the geologic history of Earth and how the length of the 4 eras compare to the overall age of Earth. How Old is the Earth?. With the person next to you, take 2 minutes to discuss the following:

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Geologic Time

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  1. Geologic Time

  2. Learning Goal • Learn the geologic history of Earth and how the length of the 4 eras compare to the overall age of Earth

  3. How Old is the Earth? • With the person next to you, take 2 minutes to discuss the following: • If you were to celebrate the Earth’s birthday, how many candles would you put on its birthday cake and why?

  4. 4.6 Billion Years Old! • The Earth is 4.6 billion years old! • That’s 4,600,000,000 years old! • To make it easier to look at the history of the Earth, it has been broken into 4 different eras: • Precambrian • Paleozoic • Mesozoic • Cenozoic

  5. Each era as unique • Precambrian: First multi-cellular organisms, development of lithosphere, hydrosphere, and atmosphere, large land masses created. • Paleozoic: First fish, fungi, amphibians, trees, reptiles, and winged insects, mountain-building (i.e. Appalachians), forests appear and become dominant. • Mesozoic: First dinosaurs, birds and mammals, mountain-building (Andes) • Cenozoic: Monkeys evolve, mountain-building (Himalayas), extinction of many species, glaciation followed by an ice age, humans evolve.

  6. Geologic Time Scale • These eras did not all last the same amount of time. • It is easiest to understand how long each era lasted in relation to the Earth’s age by placing them on a scale. • If the following scale represented your JK-12 education, where would you be right now? JK 12

  7. Geologic Time Scale • But look at the difference in how much time you spend in elementary school vs how much time you spend in high school “Elementary era” “High-school era”

  8. A history of the Earth • Working with the person next to you, complete the “Clock of Eras” on your handout.

  9. Answers

  10. Exit cards… • 3 things you learned today… • 2 things you are still unclear of… • 1 thing you liked about today’s lesson…

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