1 / 7

Volcanoes and Plate Tectonics

Volcanoes and Plate Tectonics. A volcano is a weak spot in the Earth’s crust where molten material, or magma, comes to the surface. Magma is a mixture of rock forming substances, gasses, and water from the mantle Lava is magma that has reached the Earth’s surface.

kane
Download Presentation

Volcanoes and Plate Tectonics

An Image/Link below is provided (as is) to download presentation Download Policy: Content on the Website is provided to you AS IS for your information and personal use and may not be sold / licensed / shared on other websites without getting consent from its author. Content is provided to you AS IS for your information and personal use only. Download presentation by click this link. While downloading, if for some reason you are not able to download a presentation, the publisher may have deleted the file from their server. During download, if you can't get a presentation, the file might be deleted by the publisher.

E N D

Presentation Transcript


  1. Volcanoes and Plate Tectonics • A volcano is a weak spot in the Earth’s crust where molten material, or magma, comes to the surface. • Magma is a mixture of rock forming substances, gasses, and water from the mantle • Lava is magma that has reached the Earth’s surface.

  2. Volcanoes and Plate Boundaries • Volcanic belts often form along plate boundaries. • The Ring of Fire is a volcanic belt that follows the rim of the Pacific Ocean.

  3. Diverging Boundaries • Mid-ocean ridges are a series of active volcanoes that occur along diverging plate boundaries. • Continental rift valleys also contain volcanoes.

  4. Converging Boundaries • When subduction occurs along a plate boundary the rock on top of the subducting plate melts and forms magma. • Because the magma is less dense than the surrounding rock it rises to the surface of the Earth forming volcanoes. • Island arcs form along oceanic plate boundaries where subduction occurs. • The volcanoes of the Pacific Northwest are also formed from subduction.

  5. Hot Spot Volcanoes • Hot spots are volcanoes that form above area where magma from deep in the Earth’s mantle rises and melts. • A hot spot can be found in the middle of a plate. • Yellowstone National Park, and the Hawaiian Islands are examples of hot spots. • http://www.wwnorton.com/college/geo/egeo/flash/2_10.swf

More Related