1 / 21

Volcanoes

Volcanoes. https://www.youtube.com/watch?v=VBTAcACmcgo. Volcanoes. A volcano is an opening in the Earth’s crust where magma occasionally exits Shield Volcanoes Cinder Cone Volcanoes Composite (Strato-) Volcanoes. Shield Volcanoes.

mvermillion
Download Presentation

Volcanoes

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

  2. https://www.youtube.com/watch?v=VBTAcACmcgo

  3. Volcanoes • A volcano is an opening in the Earth’s crust where magma occasionally exits • Shield Volcanoes • Cinder Cone Volcanoes • Composite (Strato-) Volcanoes

  4. Shield Volcanoes • Shield Volcanoes forms when lava quickly pours out of a vent and accumulates around the vent • Are the biggest volcanoes • Are the least explosive • Have very broad sides • Volcanoes of Hawaii

  5. Cinder Cone Volcanoes • Cinder Cone Volcanoes form when rock fragments shoot out of a volcano, fall back and accumulate around the vent • Are the smallest • Are more dangerous than Shield Volcanoes • Have the steepest sides

  6. Composite (Strato-) Volcano • Composite volcanoes form at convergent plate boundaries • A subducting plate pushes magma through the crust and forms a volcanic mountain • The most dangerous • Pacific Ring of Fire • Mt. St. Helens

  7. Hot Spots • Hot spots are unusually hot regions of Earth’s mantle where magma occasionally rises to the surface and forms a volcano • Hawaiian Islands • Yellowstone Park (Caldera)

  8. Magma • Magma is molten rock that is stored below Earth’s surface • After a volcano erupts and the magma exits Earth’s surface it then becomes lava

  9. Magma • Viscosity – A liquids resistance to flow • The slower a liquid moves the higher it’s viscosity • Higher viscosity of magma = Greater Explosion • Types of magma: • Rhyolitic – Most explosive • Andesitic – Second most explosive • Basaltic – Least explosive

  10. Pyroclastic Flow • Pyroclastic flows are violent volcanic eruptions that can send rock fragements down a slope at incredible speeds • Very hot and can contain poisonous gases • Can block out the sun and cause a climate shift

  11. https://www.youtube.com/watch?v=wsu8DPeer-o

  12. Lahar • A lahar is a mudflow caused by volcanic activity • Volcanic activity melts glaciers at the top of volcanoes • Water then moves down the mountain picking up sediment and other material

  13. https://www.youtube.com/watch?v=kznwnpNTB6k

  14. Mount St. Helens • Part of the Cascade Range which is part of the Pacific Ring of Fire • May 18, 1980-Deadliest eruption in the History of the US • 57 Dead • 250 Homes destroyed

More Related