1. Video 1

2. Questions 1 & 2 What are three things you saw in video 1?
What do all of the clips in video 1 have in common?

3. Video 2

4. Questions 3 & 4 What are three things you saw in video 2?
What do both videos have in common?

5. Notes: Earth Changes EQ: How do we categorize changes to the Earth?

6. How does Earth Change?
For 1000s of years humans have wondered about Earth’s history.
2 main view points:
1. the Earth was shaped suddenly
2. the Earth was shaped slowly over billions of years.
This argument is known as catastrophism vs uniformitarianism.

7. Catastrophism
Catastrophism- principle that states all geologic change occurs suddenly
Evidence- Biblical floods, asteroid strikes and other catastrophes created mountains, canyons, and seas.

8. Examples of Catastrophism
Earthquakes
Tsunamis
Volcanic Eruptions

9. Uniformitarianism
Uniformitarianism- principle that states the same geologic processes shaping Earth today have been working throughout Earth’s history.
Evidence: Weathering, erosion and other geologic processes happen slowly. Therefore the Earth must have been shaped slowly.

10. Examples of Uniformitarianism
weathering- the breakdown of rock
erosion- the movement of weathered rock
deposition- the dropping off of weathered rock
**** these all happen many ways… more on this later

11. Real Life
Earth has been shaped by a combination of catastrophism & uniformitarianism.
Most geologic change is slow & gradual.
But catastrophes have contributed to shaping Earth.

12. Copy and Complete How does the Earth change?
Catastrophism
Uniformitarianism
Real life
How does the Earth change?
How fast do the changes take place?
What evidence do we have?