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Aim: How do the plates of the Earth move? Do Now: Using the worksheet, “Plate Movement: In out and Sideways”, answer the following questions below. - What.

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Presentation on theme: "Aim: How do the plates of the Earth move? Do Now: Using the worksheet, “Plate Movement: In out and Sideways”, answer the following questions below. - What."— Presentation transcript:

1 Aim: How do the plates of the Earth move? Do Now: Using the worksheet, “Plate Movement: In out and Sideways”, answer the following questions below. - What forms at a spreading zone? - What forms at a fracture zone? - What three features form at a convergence zone?

2 I. Causes of Plate Motion Convection currents within the mantle push and pull the plates (ESRT p.10)

3 Convection occurs when warm material rises and cool material sinks (DENSITY!)

4 II. Types of Plate Boundaries 1. Divergent boundaries form where two plates move apart (spreading).

5 Rift valleys are found at the boundaries the divergent plates. Oceanic ridges are found on either side of the rift valley.

6 Seafloor spreading produces new oceanic crust at divergent plate boundaries

7 2. Convergent boundaries form where two plates come together. Which type of crust sinks under the other and why? Oceanic crust sinks since it is more dense.

8 Subduction zones are where one plate is forced down into the mantle beneath a second plate. trenches mark the subduction zones on the surface. Subduction zone

9 A. Oceanic Crust vs. Continental Crust Continental Volcanoes form from the rising magma. (example: Andes Mountains) Oceanic crust sinks beneath the continental.

10 B. Oceanic Crust – Oceanic Crust Volcanic Islands grow out of the ocean (example: Aleutian Islands) One of the two plates sinks under the other.

11 The two plates collide and the continents being carried are forced upward. C. Continental Crust – Continental Crust Mountain ranges form from the uplift of these continents (example: Himalayan Mountains)

12 3. Transform fault boundaries form where two plates grind/slide past each other. They move parallel

13 Faults and fractures Shallow earthquakes occur - cuts and cracks.

14 San Andreas fault in California is an example of a transform boundary

15 Boundary TypeMovementFeatures Convergent Divergent Transform

16 ESRT PAGE 5


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