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Volcanoes By Melanie Brady and Cam Colby The basics of volcanoes The three different types of volcanoes are cinder cones, composite volcanoes, and lava domes. They can be classified by their activity, their violence, or their relationships. Some can be different by the fact that some volcanoes have more activity than others. They can also be different by how much damage they can cause or some volcanoes even can erupt in different places. http://www.bing.com/images/search? q=images+of+volcanoes The anatomy of a volcano The side of a volcano is called the flank The “mouth” of a volcano is the crater The entrance is the throat http://www.bing.com/images/search?q=images+of+volcano es How do volcanoes erupt? Volcanoes occur when magma is derived from the partial melting of the subducting oceanic plate and partial mixing with materials from the overriding plate. The magma rises from the cracks in the crust. http://www.bing.com/images/search?q=images+of+volcanoes Why do volcanoes occur? Plate tectonics can help us understand this. Plate tectonics are the study of the action of the plates in the earths crust. http://www.bing.com/images/search?q=images+of+volcanoes Volcanic hazards Some hazards include: Gases Landslides Acid rains Floods Climatic changes http://www.bing.com/images/search?q=images+of+volcanoes Where do volcanoes occur? They only occur in certain places and do not occur randomly. They mostly occur on plate boundaries. They also can occur in “rings of fire” or areas with a lot of active volcanoes.. http://www.bing.com/images/search?q=images+of+volcanoes Mt. Vesuvius It is considered one of the worlds worst volcanoes Its most famous eruption was in AD 79 in Pompeii It is estimated that it killed over 2,000 people http://en.wikipedia.org/wiki/Mt_Vesuvius Mt. St. Helens Most famous eruption was on May 18th, 1980 Killed 57 people, destroyed 250 homes, 47 bridges, 15 miles of railway and 185 miles of highways It is located in Skamania county, Washington state http://en.wikipedia.org/wiki/Mt._St._Helens More facts about volcanoes Some volcanoes result from “hot spots” in the earths mantle. Some volcanoes can cause hot springs if magma goes into contact with groundwater. Rock and other materials formed from lava can create a variety of landforms. http://www.bing.com/images/search?q=images+of+volcanoes What are the early warning signs of volcanoes? • • • • • Earthquakes Mountains collapsing Ash Mudflows Tephra- solid matter that is ejected in the air by a volcano http://www.bing.com/images/search?q=images+of+volcanoes What was the first recorded volcanic eruption? It was in Turkey in a painting in a house and would have been made around 6200 BC. http://www.bing.com/images/search?q=images+of+volcanoes Video of Mt. St. Helens erupting This video has the May 18th eruption in 1980. http://www.youtube.com/ THE END And that is our presentation for Mr. Slingsbys 6th grade Webquest http://www.bing.com/images/search?q=images+of+volcanoes