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Earth’s Story. How is the Earth shaped? Uniformitarianism – the belief that Earth has changed gradually and continuously over time. “the present is the.

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Presentation on theme: "Earth’s Story. How is the Earth shaped? Uniformitarianism – the belief that Earth has changed gradually and continuously over time. “the present is the."— Presentation transcript:

1 Earth’s Story

2 How is the Earth shaped? Uniformitarianism – the belief that Earth has changed gradually and continuously over time. “the present is the key to the past” Catastrophism – All geologic changes occur suddenly.

3 Which one is true? Modern geologists believe Earth is shaped by both!  Gradual processes such as erosion and weathering  Sudden changes like a meteor impact or a volcanic eruption

4 Relative Dating?? Relative dating – is time in relationship to something else Which came first?? It is like saying I am older than you but you do not know by how much!

5 Relative Dating Activity I stood in the checkout line. I selected two apples. I walked home from the store. I gave the cashier the money. I went to the store. The cashier gave me my change. I was hungry.

6 Hopefully…..  I was hungry.  I went to the store.  I selected two apples.  I stood in the checkout line.  I gave the cashier money.  The cashier gave me my change.  I walked home from the store.

7 Law of Superposition The law states that the younger/newer rocks are on top of or above older rocks.

8 Everyday Examples Pile of laundry. Bricks used to build a house. Your school folder. Stack of magazines.

9 Disturbing Forces! Rock layers can be disturbed by forces from within the Earth.  rocks can intrude  rocks can tilt  rocks can fold  faults form Because of these disturbances the sequence of the layers may be changed.

10 List in order from youngest to oldest.

11 Did you get the correct answer?? Youngest E D A B C Oldest

12 Geologic column A sequences of rock layers that contain all the known fossils and rock formations on Earth arranged from oldest to youngest.


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