1. Bellringer Create an explanation that correlates plate tectonics, earthquakes, AND volcanoes.

2. Volcanoes and Plate Tectonics Notes

3. Volcanoes and Plate Boundaries A volcano is a weak spot in the crust where melted material comes to the surface. The melted material is called magma. Magma rises to the surface because it is less dense than solid rock.

5. Volcanoes and Plate Boundaries Most volcanoes happen at either a convergent plate boundary or a divergent plate boundary. Where plates pull apart, magma eventually rises and pours out of cracks in the crust. Where plates push together, the denser plate subducts into the mantle. Some of the sinking plate melts and forms magma. The magma rises and pours out of cracks that forms along the surface.

7. Click to play animation Divergent Volcanism

8. Convergent Volcanism Click to play animation

10. Volcanoes and Plate Boundaries Once magma reaches the surface, it is called lava. As lava cools, it forms solid rock. Lava can build up to form mountains. When the mountains are on the ocean floor, islands form if the mountains breach the water’s surface.

13. Hot Spot Volcanoes A hot spot is a place where material rises from deep in the mantle. The material forms magma. If the magma breaks through the crust, a volcano forms. How spot volcanoes on the ocean floor can become islands. This is how the Hawai’ian Islands formed. As the Pacific Plate continues to move, the hot spot remains stationary, continuing to punch up through the crust.

14. http://www.wiley.com/college/strahler/0471480533/ani mations/ch14_animations/hot_spot.html

15. Newest Islands Oldest Islands now Seamounts Plate Mov’t over millions of years Hot Spot Location

16. Hot Spot Volcanoes Some hot spots are under the middle of plates, far from plate boundaries. For example, there is a hot spot under the North American Plate at Yellowstone National Park in Wyoming.