1 / 13

Volcanoes!

Volcanoes!. Volcanoes!. What is a Volcano? A volcano is any opening in the Earth’s crust where magma, ash and gas are able to reach the surface Volcanoes may have more than one opening which are called vents The main vent is known as the crater. Volcanoes!. What is a Volcano?

gkurth
Télécharger la présentation

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. Volcanoes! • What is a Volcano? • A volcano is any opening in the Earth’s crust where magma, ash and gas are able to reach the surface • Volcanoes may have more than one opening which are called vents • The main vent is known as the crater

  3. Volcanoes! • What is a Volcano? • Far below the crater is the magma chamber • Magma rises from the magma chamber, through a conduit, into the throat of the volcano, until it reaches the crater

  4. Volcanoes! • Large Magma Chamber • Bedrock • Conduit (pipe) • Base • Sill • Dike • Layers of Ash Emitted by the Volcano • Flank • Layers of lava emitted by the Volcano • Throat • Parasitic Cone • Lava Flow • Vent • Crater • Ash Cloud

  5. Volcanoes! • What Causes Volcanoes? • Volcanoes are caused by one of three things: • Convergent tectonic plates, usually at a continental-oceanic plate subduction zone • Divergent tectonic plates, usually at a mid-oceanic ridge • Mantle plumes a.k.a. “hot spots”

  6. Volcanoes! • Three Major Types of Volcanoes • Shield Volcano • Broad with gentle slope similar to a shield • Produced by low-viscosity lava flows • Mild eruptions • More common in oceanic than continental settings

  7. Volcanoes! Mauna Kea in Hawaii

  8. Volcanoes! • Three Major Types of Volcanoes • CompositeVolcano (Stratovolcano) • Tall with steeper slopes similar to a cone • Produced by high-viscosity lava flows • Explosive eruptions of alternating layers of ash, cinders and lava • More common in subduction zones

  9. Volcanoes! Mount Fuji in Japan

  10. Volcanoes! Mount Mayon in Phillipines

  11. Volcanoes! • Three Major Types of Volcanoes • Cinder Cone • Small with steepest slopes • Produced by explosive lava flows • Violent eruptions • Commonly found around shield or composite volcanoes

  12. Volcanoes! Sunset Crater in Arizona

  13. Volcanoes! Capulin Volcano in New Mexico

More Related