1 / 15

Redoubt, AK

18.2 Notes: Volcano Anatomy Main Idea 1 : Volcanoes look like mountains, but they form as a result of repeated eruptions of magma from underground. Redoubt, AK. http://www.youtube.com/watch?v=g1UWTwDwZp8. Active Volcano. Has erupted during past 100 yrs. . Dormant Volcano.

emma
Télécharger la présentation

Redoubt, AK

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. 18.2 Notes: Volcano AnatomyMain Idea 1: Volcanoes look like mountains, but they form as a result of repeated eruptions of magma from underground. Redoubt, AK

  2. http://www.youtube.com/watch?v=g1UWTwDwZp8 Active Volcano Has erupted during past 100 yrs.

  3. Dormant Volcano Has not erupted recently, but might Mount Edgcumbe, near Sitka AK

  4. Extinct Volcano Has not erupted in 1,000 yrs. Scientist think it might not erupt ever again.

  5. Crater Formation: Bowl-shaped opening produced by vent explosions & lava flow

  6. Side Vents Describe: Cracks in the crust, where magma can squeeze through.

  7. Central Vents Describe: Main pipeline from magma chamber to the outside of the volcano.

  8. Magma Chamber Conditions: Under extreme pressure, very hot, & is rising towards Earth’s surface.

  9. Main Idea 2: Three major things come out an erupting volcano: 1. gas 2. lava 3. tephra

  10. Gas Explain: The high pressure of magma can keep gases dissolved. As magma leaves volcano, pressure decreases, gas is released.

  11. Tephra Describe: Solid particles, such as ash & pumice, are spewed out the volcano’s top.

  12. Lava Define: Magma that is released above the ground. Influence of Silica Content: Silica determines the viscosity; more Si increases viscosity & slows lava flow.

  13. Lava Formations: Pillow Lava Describe: Magma that is released underwater & cools quickly.

  14. Lava Tubes Describe: Tunnels that extend from volcanic vents through the long stretch of lava flow.

  15. Pyroclastic Flow Describe: A destructive mixture of gas & ash that can reach temps. Of 700degrees C & travels down the side of a volcano at 125mph!!!!!

More Related