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Volcanic Activity

Volcanic Activity. Volcanoes, explosions and more!. Igneous __________- classified by shape, size, and orientation. Intrusions. Magma Source. Areas Where Magma Forms Upper mantle depths of 50 to 250 km High temps (800-1100 C), medium pressure Rocks melt, or partially melt

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Volcanic Activity

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  1. Volcanic Activity Volcanoes, explosions and more!

  2. Igneous __________- classified by shape, size, and orientation Intrusions

  3. Magma Source • Areas Where Magma Forms • Upper mantle • depths of 50 to 250 km • High temps (800-1100 C), medium pressure • Rocks melt, or partially melt • Divergent plate boundaries • Above subduction zones • Hot spots

  4. Major Volcanoes Around the World

  5. Wahalua Visitors’ Center Aflame in Hawaii Source: Photograph by J.D. Griggs, USGS Photo Library, Denver, CO.

  6. Ruins of the Visitors’ Center After Lava Cooled Source: Photograph by J.D. Griggs, USGS Photo Library, Denver, CO.

  7. There are three types of volcanic cones: Cinder • ______ – explosive eruptions, small but steep slopes, pyroclastics (like ash) • _______ – nonexplosive eruptions, fluid basaltic lava, gentle broad slopes • _________ – alternating between lava and pyroclastics, explosive and nonexplosive eruptions, steep and tall Shield Composite

  8. A common type of volcano is called a _____ _____, these can explode like a bottle pop due to high pressure cinder cone

  9. Kilauea on Hawaii is a good example of a _______ cone, with less explosive eruptions and less viscous lava. shield

  10. Mt Rainier and Mt St Helens are good examples of __________ cones, with explosive eruptions and erupted materials such as ash, bombs, and blocks. composite Mt St Helens Mt Rainier

  11. Crater Lake in Oregon is a __________formed from the collapse of the gigantic volcano Mount Mazama. caldera

  12. Famous Volcanic Disasters • Pompeii was destroyed and completely buried during a long catastrophic eruption of the volcanoMount Vesuvius spanning two days in 79 AD. The eruption buried Pompeii under 4 to 6 meters of ash and pumice, and it was lost for over 1,500 years before its accidental rediscovery in 1599.

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