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Published byRoland Gregory Modified over 9 years ago
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A volcano is a mountain that forms when magma escapes the through the crust and cools.
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Magma comes to the surface because it is less dense then the rock. Remember, substances of lesser density float on top of more dense items.
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Magma chamber : The large underground pool of liquid rock found beneath the surface of the Earthrock Main Vent: A point source of the Earth's surface where lavas ash and gas are erupted. lavas Lava: Molten rock that reaches the earth's surface through a volcano Crater: a bowl-shaped formation at the top of a volcano. Layers of Ash and Lava: As ash settles and lava cool, more and more layers accumulate. Secondary Cone: A second opening to the volcano attached to the main tube, allowing gas, ash and lava to escape.
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Is wide and flat. It forms from a quiet eruption. Lava flows out quietly and for great distances
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Has tall, very steep sides. Has explosive eruptions. This eruption produces a lot of cinder and ash.
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Form from explosive eruptions. Produce a lot of lava and ash. Is small, with steep sides.
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