"Volcanic Eruptions and Hazards. What is a volcano? A volcano is a vent or '
chimney' that connects molten rock (magma) from within the Earth's crust to the ..."
http://www.earth4567.com/talks/volcanoes/Volcanoes.ppt
"Volcanic Eruptions and Hazards. What is a volcano? A volcano is a vent or '
chimney' that connects molten rock (magma) from within the Earth's crust to the ..."
http://www.earth4567.com/talks/volcanoes/Volcanoes.ppt
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