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Volcanoes (Volcanic Eruptions (When magma surfaces, it might erupt as a…
Volcanoes
Volcanic Eruptions
When magma surfaces, it might erupt as a lava flow.
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pahoehoe - fast moving, low viscosity
aa - slow moving, high viscosity
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Explosive eruption - start with vent blocked. High viscous lava. Pressure releases at weak point (crater)
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Gases - water vapor, carbon dioxide, sulfur oxide
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How do Volcanoes Form?
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Movement of Earth's tectonic plates causes the formation of volcanoes and the eruptions that result.
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Types of Volcanoes
Shield volcanoes - are common volcanoes along divergent plate boundaries and oceanic hot spots. Shield volcanoes are large with gentle slopes of basaltic lavas.
Composite volcanoes - are large, steep-sided volcanoes that result from explosive eruptions of andesitic and rhyolitic lava and ash along convergent plate boundaries.
Cinder cones - are small, steep-sided volcanoes that erupt gas-rich, basaltic lavas.
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Where do Volcanoes form?
The ring of fire represents an area of earthquake and volcano activity that surrounds the Pacific Ocean.
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