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Volcanoes (Volcanic Eruptions (volcanic ash - tiny particles of pulverized…
Volcanoes
Volcanic Eruptions
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Effects of Volcanic eruptions are lava flows, ash fall, mudflows
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How do Volcanoes form?
Scientists have learned that the movement of Earth's tectonic plates causes the formation of volcanoes and the eruptions that result
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Eruption Style
Quiet - pours out runs down the side of the volcano; pahoehoe - fast moving low viscosity, aa - slow moving high viscosity
Explosive- start with vent blocked, high viiscosity lava, pressure releases at weak point(crater)
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What is a Volcano?
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Lava - above the surface
pahoehoe-smooth, shiny surface, usually dark colored
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Types of Volcanoes
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Composite volcanoes - are large, steep-sided volcanoes that result from explosive eruptions of andesitic
Cinder cones - are small, steep-sided volcanoes that erupt gas-rich
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Super Volcano
large, often mistaken for multiple volcanoes
Where do Volcanoes form?
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The Ring of Fire represents an area of earthquakes and volcanic activity that surrounds the Pacific Ocean
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Myths
Pompeii
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Population estimated11,000 prople
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