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Transcript
Volcanoes Advanced Organizer 1. What is a volcano? A volcano is a _________________ that forms when __________________________ and _________________________ erupt and build up around a _____________. Most of Earth’s volcanoes are ___________________, meaning not active. There are over ______ active volcanoes currently on Earth. Active means erupted in the last ____________ years. Where is the nearest volcano to Tucson located? ___________________________________ 2. Features of a volcano include: ________________ – melted rock/molten material ______________________________________________. ___________ – Opening in Earth’s surface where ________________________________________________. __________ – Magma that has flowed _________________________________________________________. ________________ – Opening at the _____________________________________________________ Ash and Gas – Explode ______________________________________________. 3. Where do volcanoes occur? Volcanoes can occur at _____ places: definition 1. 1. Divergent Boundaries 2. Convergent boundaries 3. Hot Spot diagram example Volcanoes in Iceland Andes mountains in South America, Cascade mountains in NW USA Hawaiian island chain, Yellowstone 1 4. _____ types of volcanic eruptions Magma that contains trapped __________ causes eruptions to be ______________________. Think of ___________________ a can of soda and then opening it. Explosive eruptions have a lot of _____________ in the magma, for example melted granitic rocks. ___________________________________is a good example of an explosive volcano. Magma with _____________ silica is ___________________ and flows quietly from the volcano. Quiet eruptions have ____________________ magma. Good examples of quiet eruptions are ________________________ and Iceland. 5. Shape of Volcanoes. There are ___ types of volcanoes, based on ____________________ and eruption ________________. definition sketch Shield Composite Cinder cone Video: Volcano Krakatoa Where is it located? How fast is Anak Krakatau (child of Krakatoa) growing? 2