1. Plate Tectonics An original Power Point presentation by Lindsey Durham

2. Plate Tectonics The crust of the Earth is not an unbroken shell but is made of plates (slabs of rock) that move.

3. Plate Tectonics Continental Drift –The plates are still moving today 4 inches/year

4. Plate Tectonics 3 Types of Plate Movements –Divergent –Convergent –Transform

5. Plate Tectonics Divergent plates –Occurs when 2 oceanic plates move apart. –Magma from the mantle rises through the new crack. –The magma cools and new ocean floor is created. –This is called sea floor spreading.

6. Plate Tectonics Convergent Plates 2 plates push against each other. –3 types 2 Continental plates 1 Continental and 1 Oceanic 2 Oceanic plates

7. Plate Tectonics 2 Continental –The 2 plates push against each other making folds which create mountains.

8. Plate Tectonics 1 Continental and 1 Oceanic –Subduction occurs The oceanic plate slides under the continental plate because it is lighter. The impact causes crack in which magma flows up through. The cooled magma builds up creating volcanoes.

9. Plate Tectonics 2 Oceanic Plates –Subduction occurs and magma flows up the crack forming volcanoes.

10. Plate Tectonics Transform Plates –2 plates slide against each other –Fault lines created Cracks in the earth’s crust –When the plates move the cause earthquakes

11. Plate Tectonics Tsunamis –Underwater earthquakes that can cause HUGE waves.