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 ( 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: ______ – 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 Cinder Shield Composite

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

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

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

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

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.volcanoMount Vesuviusashpumice