Name: Volcanoes 1. Is there a difference between magma and lava? 2. Which (lava or magma) rises to Earth’s surface? Why does it do this? 3. What is the name of the volcanic structure where magma collects before an eruption? 4. What are the characteristics of the magma associated with a quiet eruption? (Discuss silica, water content, temperature and viscosity) 5. What are the characteristics of the magma associated with an explosive eruption? (Discuss silica, water content, temperature and viscosity) 6. Would a pyroclastic eruption be quiet or explosive? Shield Volcano Types: Matching Composite Cinder cone 7._____________________ Steep sided, tall and often snow-caped 8._____________________ Large and broad, gently sloping, NOT steep sided 9._____________________ Simple, small, and steep sided 10.____________________ Has quiet eruptions of liquidy lava 11.____________________ Has eruptions of cinders, ash, and lava 12.____________________ Has explosive and dangerous eruptions of gas, ash, and super-heated rock fragments. 13.____________________ The Hawaiian volcanoes 14.____________________ Mt. St. Helens in Washington state or Mt. Pinatubo in the Phillipines 15.____________________ Volcanoes in California. Name: 16. True or False: Most of the world’s volcanoes occur along plate boundaries. 17. A region of active magma under the crust that feeds volcanoes is known as a/an: __________________________ 18. The subduction zone along the edge of the Pacific Ocean plate, where many volcanoes are found is known as the ___________________ _______ _______________. 19. Identify the volcano based on its picture. A. _______________________ B. _______________________ C. _______________________ 20. The Hawaiian volcanoes formed over a _____________________________ a. sea floor spreading zone b. rift zone c. hot spot d. subduction 21. The reason why the Hawaiian islands are a chain of islands is because … a. The ocean floor moves over a hot spot b. The hot spot keeps moving 22. Based on the picture, which is the OLDEST Hawaiian island? 23. Mt. Uzen is a volcano in Japan. Japan is located on a plate boundary, where the pacific ocean plate meets the continental Eurasion plate. How might Mt. Uzen have formed? a. It formed by subduction. b. It formed by sea floor spreading c. It formed over a hot spot. d. It formed at a rift zone. Name: 24. The volcanoes in Iceland sit on top of the Mid-ocean ridge. These volcanoes formed by: a. Rifting b. Sea floor spreading c. hot spot d. subduction 25. The volcanoes in Africa form on a plate boundary where two land plates pull apart from one another. These volcanoes form by … a. Rifting b. Sea floor spreading c. hot spot d. subduction 26. An underwater volcano is called a: ________________________. Matching: Volcanic features that are not VOLCANOES. Sill Volcanic Dike Batholith Lava Plateau 27. ________________ An enormous collection of magma that cools under the surface and pushes up the rock on top of it to make mountains. 28. ________________ When lava comes out of fissures/cracks in the ground and runs all over the surface before hardening. This lava builds layer upon layer over time. 29. ________________ When magma squeezes between rock layers and hardens. The magma hardens parallel to the existing rock layers. 30. ________________ When magma squeezes through rock layers and hardens. The magma cuts across rock layers.