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VolcanoMI

Main IdeaAnswer
Vent Opening in the crust from which magma escapes.
Crater Steep walled depression around the volcanic vent.
Pipe The passway between the magma chamber and the vent.
Magma Chamber Large underground pool of magma.
Divergent Boundaries When plates seperate, lava rises and cools then hardens forming islands. -Iceland
Convergent Boundaries When an ocean plate goes under a continental plate, magma is pushed upward.-Andes Mountains (More Violent)
Hot Spots Hot rock is forced up as a result of the boundary between the mantle and core.
Describe the force that pushes magma out of a volcano.(Memerise) 1)Dissolved gasses are trapped in magma. 2)When magma rises the pressure on the gases from surrounding rock decrease. 3)The gases expand and form bubbles. 4)The force of the expanding gas pushes magma out of the Earth.
Quiet Eruption See yellow page (i think)
Explosive Eruption Erupt suddenly, with terrifying force. These form when magma has cooled to make a lava plug blocking a crater. This traps magma under the ground until the pressure becomes too great. Then magma explodes out of the volcano.(See Other Eruptions Print-out)
Shield Broad, gentle, sloping; quiet; basaltic; ex Kilawea
Cinder Cone Steep sided loosely packed packed; explosive; ex Paricutin
Composite Explosive eruption forms layers of tephra; queit; Forms lava layers; ex Nevado del Ruiz
Batholith Large igneous rock formed when magma is being forced upwards and cools.
Dike Magma is forced into a VERTICAL crack in rock and hardens and soildifys.
Sill Magma is forced into a HORIZONTIAL crack in rocky layers.
Volcanic Neck when magma hardens in the pipe of a volcano.
Caldera After an eruption empties the magma chamber.
Created by: webrocker8
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