1 / 7

Volcanoes

Volcanoes. A volcano is a mountain that forms when magma escapes the through the crust and cools. What is a Volcano?. Magma comes to the surface because it is less dense then the rock. Remember, substances of lesser density float on top of more dense items.

blair-cain
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. A volcano is a mountain that forms when magma escapes the through the crust and cools. What is a Volcano?

  3. Magma comes to the surface because it is less dense then the rock. Remember, substances of lesser density float on top of more dense items. Why does magma come to the surface?

  4. Magma chamber : • The large underground pool of liquid rock found beneath the surface of the Earth What are the parts of a volcano? • Crater: • a bowl-shaped formation at the top of a volcano. • Main Vent: • A point source of the Earth's surface where lavas ash and gas are erupted.  • Lava: • Molten rock that reaches the earth's surface through a volcano  • Layers of Ash and Lava: • As ash settles and lava cool, more and more layers accumulate. • Secondary Cone: • A second opening to the volcano attached to the main tube, allowing gas, ash and lava to escape.

  5. Is wide and flat. It forms from a quiet eruption. Lava flows out quietly and for great distances Are all Volcanoes alike? Shield Volcano

  6. Has tall, very steep sides. • Has explosive eruptions. • This eruption produces a lot of cinder and ash. Cinder Cone Volcano

  7. Form from explosive eruptions. • Produce a lot of lava and ash. • Is small, with steep sides. Composite Volcano

More Related