1 / 18

When Volcanoes Erupt PG . 107

When Volcanoes Erupt PG . 107. Volcano. a break/hole on the crust of Earth that emits lava , ash , and gases. (usually forms a mountain). What’s inside a volcano?. Crater The central funnel shaped vent at the top of a volcano

evette
Download Presentation

When Volcanoes Erupt PG . 107

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. When Volcanoes Erupt PG. 107

  2. Volcano • a break/hole on the crust of Earth that emits lava, ash, and gases. (usually forms a mountain)

  3. What’s inside a volcano? Crater The central funnel shaped vent at the top of a volcano Vent—an opening at the surface of the Earth through which volcanic material passes MagmaChamber—the body of molten rock that feeds a volcano Magma Chamber

  4. What are non- explosive eruptions? Volcanoes that erupt only lava and gas The most common type of eruption

  5. What erupts from a volcano? 1. Lava-- 4 types Pahoehoe Flows slowly, smooth glassy surface A’a—pours out quickly, brittle jagged surface

  6. Pillow lava—lava that erupts under water Blocky lava—sharp edged chunks of stiff lava

  7. What are explosive eruptions? Clouds of hot rock, ash and gas rapidly shoot out from the volcano Millions of tons blast out in a few seconds

  8. 2. Pyroclastic material 4 types of material Bombs—large blobs of magma that harden when they fly through the air Blocks—largest pieces of solid rock blown away from the volcano

  9. 4. Volcanic ash– magma explodes into tiny glass like slivers 3. Lapilli—little stones of magma that harden before they hit the ground

  10. What are pyroclastic flows? Enormous amounts of hot ash, dust and gas are ejected from a volcano Races downhill at more than 200 km / hr Temperatures can exceed 700 degrees C

  11. What are the effects of volcanic eruptions? Climate can be changed as ash and gas spread throughout the atmosphere Eruptions can affect the whole Earth with lower temperatures

  12. Other effects… Pyroclastic materials (ash and rock) can travel at high speeds and can be deadly Lava can be very destructive—it’s very hard to stop

  13. Mt. Vesuvius and Pompeii

  14. Mt. Vesuvius and Pompeii

  15. What are other types of Volcanic Landforms? 3 types 1. Lava Lakes- large amounts of molten lava contained in a depression A

  16. 2. Calderas A semicircular depression that forms when the magma chamber partly empties and causes the ground above to sink Many times larger than a crater

  17. 3. Lava Plateaus A wide flat area caused by repeated nonexplosive eruptions of lava that spread over a large area

More Related