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Transcript
Volcanic Activity Volcanoes, explosions and more! Intrusions Igneous __________classified by shape, size, and orientation 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 Major Volcanoes Around the World Wahalua Visitors’ Center Aflame in Hawaii Source: Photograph by J.D. Griggs, USGS Photo Library, Denver, CO. Ruins of the Visitors’ Center After Lava Cooled Source: Photograph by J.D. Griggs, USGS Photo Library, Denver, CO. There are three types of volcanic cones: Cinder – explosive eruptions, small but ______ steep slopes, pyroclastics (like ash) Shield – nonexplosive eruptions, fluid _______ basaltic lava, gentle broad slopes Composite – alternating between lava _________ and pyroclastics, explosive and nonexplosive eruptions, steep and tall A common type of volcano is called a cinder cone _____ _____, these can explode like a bottle pop due to high pressure Kilauea on Hawaii is a good example of shield a _______ cone, with less explosive eruptions and less viscous lava. Mt Rainier and Mt St Helens are good examples of __________ composite cones, with explosive eruptions and erupted materials such as ash, bombs, and blocks. Mt St Helens Mt Rainier Crater Lake in Oregon is a __________formed caldera from the collapse of the gigantic volcano Mount Mazama. Famous Volcanic Disasters Pompeii was destroyed and completely buried during a long catastrophic eruption of the volcano Mount 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.
