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Download 10/12/09 Volcanoes and Plate TectonicsCh
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Name: _________________________________ Volcanoes and Plate Tectonics Section 1 I. What is a volcano? ____________________________-weak spot in the crust where molten material comes to the surface. ___________________________- a molten mixture of rock-forming substances, gases, and water from the mantle. Lava- ______________that reaches _________________ surface. II. Where are most volcanoes found? _____________________________________- areas along plate boundaries where there are many volcanoes. ______________________- major volcanic belt formed by the many volcanoes that rim the Pacific ______________. III. The Ring of Fire ___of the world’s volcanoes are found in the Ring of Fire. 90% of the world’s EQs happens in the Ring of Fire. Why? The ______________________________ of the Pacific Plate. IV. Volcanoes and Diverging Boundaries Volcanoes form at _________________ridges and ___________ valleys, which are diverging plate boundaries. V. Volcanoes and Converging Plate Boundaries These volcanoes form in 2 ways. Volcanoes can form when two __________________plates collide or when an oceanic plate collides with a _______________________________ plate. VI. Island Arc Volcanoes Form when ___________ oceanic plates collide. The subducting plate melts to create magma. This magma rises up through the ocean floor to form volcanic ____________________. VII. Continental Arc Volcanoes Form when an _________________ plate & a _________________________plate collide. The oceanic plate is subducted under the cont. plate causing it to melt into magma. The magma rises through the continent to form _______________________________. VIII.Hot Spot Volcanoes _______________________________- is an area where material from deep within the mantle rises and then melts forming magma. Hot spot can be near plate boundaries or in the middle of a plate. IX. Hot Spot A volcano forms above a hot spot when magma erupts through the crust and reaches the surface. As the plate moves, new _______________________________ will form over the Hot Spot.
