1. Volcanoes and Plate Tectonics (pages 200–203) Volcanoes and Plate Boundaries

2. Key Concept: Volcanic belts form along the boundaries of Earth’s plates.

4. 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. Most volcanoes happen at plate boundaries. Remember, plate boundaries are where two plates pull apart or push together.

6. Where plates pull apart, magma rises and pours out of cracks in the crust.

7. Where plates push together, the denser plate sinks into the mantle. Some of the sinking plate melts and forms magma. The magma rises and pours out of cracks.

8. Once magma reaches the surface, it is called lava. As lava cools, it forms solid rock.

9. Lava can build up to form mountains. When the mountains are on the ocean floor, islands form if the mountains poke above the water’s surface.

10. Answer the following questions

11. A weak spot in the crust where melted material comes to the surface is a(an). Volcano

12. Melted material that comes to the surface in a volcano is called. magma

13. Once melted material reaches the surface, it is called. lava

14. When lava cools to a solid, it forms rock

15. The diagram shows how some volcanoes form. Which plate, A or B, is turning into magma?

17. Hot Spot Volcanoes (page 203) Objective 2: Students will be able to… Explain how hotspot volcanoes form.

18. Key Concept: A volcano forms above a hot spot when magma erupts through the crust and reaches the surface.

19. A hot spot is a place where material rises from deep in the mantle. The material forms magma.

20. If the magma breaks through the crust, a volcano forms. Hot spot volcanoes on the ocean floor can become islands. This how the Hawaiian Islands formed.

21. 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.

22. Answer the following questions Boardwalk in Yellowstone National Park,

23. Circle the letter of each sentence that is true about hot spots. a. Hot spots occur only at plate boundaries. b. Hot spots can cause volcanoes. c. Hot spots can cause islands to form.

24. true or false? The Hawaiian Islands were formed by hot spot volcanoes. true

25. Hot Spot Volcanoes (page 203) Objective 2: Students will be able to… Explain how hotspot volcanoes form.

26. The End