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# 3.1 deformation of the earths crust

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### 3.1 deformation of the earths crust

1. 1. Deformation of the Earth’s Crust Mr. Silva
2. 2. Objective• Students will be able to describe isostatic adjustment by using an analogy of comparing cargo ships to mountain ranges.• Students will be able to identify three stresses acting on the Earth’s crust and correlate at which boundary each stress occurs.
3. 3. What do you think of when you hear… the Himalayans, the Rockies, the Andes, the Sierra Nevada?These imposing landforms are visible reminders that the shape of the earth’s surface is always changing.
4. 4. How the Crust is Deformed• Deformation of the crust is the bending, tilting, and braking of the earth’s crust.• Plate tectonics is the movement of the earth crust, but it’s not the only force that shapes the earth’s crust
5. 5. Isostatic Adjustment• Isostatic adjustment occurs in the earth’s crust because of the change in the weight in some parts of the crust.
6. 6. Isostatic Adjustment• When crusts are thicker and heavier they move deeper into the mantle. KSSIN
7. 7. Isostatic Adjustment• When crusts are thinner and lighter, it will rise higher on of the mantle. ISES R
8. 8. Isostatic Adjustment• Take a second and think of a CARGO SHIP.
9. 9. Isostatic Adjustment• This up-and-down movement in the crust occurs because of two opposing forces• The crust is always trying to reach a balance.• That balance is known as isostatic! ISOSTATIC = BALANCE