1 / 18

Welcome to Science 10/25

Learn about different types of volcanoes and how they erupt. Explore quiet and explosive eruptions, magma composition, and stages of volcanic activity.

jonie
Download Presentation

Welcome to Science 10/25

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. Welcome to Science 10/25 • Get out your lab sheet. You have 3 minutes to create the type of volcano listed on your card. Have your group help you if needed. • Today’s Schedule • 1. Finish/Review Volcano Types Lab • 2. Outline/Notes Volcanic Eruptions • 3. Yokum Construction Co. will be open for business to sell building materials.

  2. Volcano Types • Shield, Cinder-Cone, and Composite. • What causes these different types of volcanoes to form? • The different ways in which they erupt and the different materials that are erupted.

  3. Volcanic Eruptions Section. 3

  4. Pele

  5. I. Kinds of Volcanic Eruptions • Eruptions are classified as either quiet or explosive. • How a volcano erupts depends on the gasses, silica, and viscosity of the magma. • Silica-similar to sand, one of the key components of magma • Viscosity- the resistance of a liquid to flow

  6. II. How the Eruption Works • A volcanic eruption is similar to an exploding pop can. • Gasses inside the volcano build up. As gas builds up, so does the pressure. When the pressure is too great, the volcano erupts. BBC NEWS | Science/Nature | Animated guide: Volcanoes • OUR RESTLESS PLANET

  7. III. Quiet Eruptions • Magma has low silica, low viscosity, and low gasses so it flows easily. • Hawaiian Islands were made this way. • OUR RESTLESS PLANET • What type of volcano is formed by quiet eruptions? • Shield

  8. IV. Explosive Eruptions • Magma has high-silica and high viscosity, making it thick and sticky. High Gas. • Magma does not flow. • Builds up in the pipe like a cork in a bottle . • Pressure builds up until the volcano explodes. • :: Make a Volcano

  9. Mount St. Helens mt. st. helens - Google Videos# During Eruption

  10. Mount St. Helens Before Eruption After Eruption "Mt. Saint Helens' Powerful Erruption"

  11. Mt. St. Helens 2003 Mt. St. Helens 1984

  12. V. Explosive Eruptions • Explosive eruptions break lava into fragments that quickly cool into pieces of different sizes. • Large pieces = bombs • Small pieces = cinders • Pyroclastic flow- mixture of hot gas, ash, cinders, and bombs • -pyroclastic-flow-video.htm

  13. VI. Stages of Volcanic Activity • Active, dormant, or extinct? • Active- erupting or shows signs of erupting. • Dormant- may awaken in the future. • Extinct- unlikely to erupt again • Is a volcano ever really extinct? • No, at anytime a volcano thought to be extinct could reawaken.

  14. How It All Starts • Magma from the mantle rises up through the crust because it is less dense. • Magma becomes trapped beneath layers of rock. • Weak spots in the crust allow trapped magma to reach the surface, forming a volcano.

  15. At the Surface Pipe, Vent, Magma Chamber, Crater, Lava Flow • Magma Chamber- pocket of magma beneath a volcano • Pipe- long tube that connects the magma chamber to the surface • Vent- opening where molten rock and gas leave the volcano

  16. At the Surface • Lava flow- area covered by lava as it pours out of a vent. • Crater- bowl shaped area that may form at the top of a volcano.

  17. Correctly the match the stages of volcanoes with the definitions. A. A volcano that is unlikely to erupt again. B. A volcano that is erupting or shows signs of erupting. C. A volcano that may awaken in the future Active Dormant Extinct Question of the Day

  18. Today’s Objectives • 1. Question of the Day • 2. Open book quiz • 3. Continue research on volcanoes

More Related