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Volcanoes - Volcanoes Volcano and Lava Types 1 H igher...

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Volcanoes Volcano and Lava Types 1. Higher Silica content higher viscosity more explosive 2. Lower silica content lower viscosity less explosive 1. Basalt lave = quiet eruptions; most oceanic volcanic and hawaiian made of this 2. Rhyolite = very explosive , rhyolite domes in Yellowstone park; whiteish grey 3. Ignious = rocks made from volcanic activity; lighter colour 4. Olivine – found in common lava in Hawaii 5. High viscosity = granite 6. Low viscosity = bubbles formed due to rapid cooling 7. Magma – molten rock 8. Lava- magma that flows onto ground surface Products of Volcanoes 1. lava 9. Pyroclactic Material – fragment of solidified magma blown out of volcano, fragments (small and large) may be deposited by pyroclactic density current PDC ( hot flow and billowing tephra 10. Lahar – mudslide of volcanic material ; can bury buildings Basaltic Lava Forms 1. Low Viscosity Flow 1. Pahoehoe Flow: basalt lava with a ropy or smooth top ; flows quickly 1. High Viscosity FLow
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1. Aa Flow: blocky basalt lava with a ragged , clinker surface Shield Volcanoes 1.
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