PSNB+3.2

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Vocabulary

 * Magma Chamber:** A pocket that magma collects in beneath a volcano
 * Pipe:** A long tube in the ground that connects magma chamber to the surface of the earth
 * Vent:** An opening where molten rock+gas leave the volcano
 * Lava Flow:** The area covered by lava as it flows out of a vent
 * Crater:** Bowl-shaped bend in land that might form at the top of a volcano, around its central vent
 * Silica:** A material formed from the elements silicon and oxygen
 * Pahoehoe:** A fast/quick moving hot lava
 * Aa:** A cool and slow moving lava
 * Active:** Volcano that's erupting or is showing signals of erupting soon
 * Dormant:** A sleeping volcano that is kind of like a sleeping bear
 * Extinct:** A dead volcano, most likely won't erupt soon
 * Hot Spring:** Forms when groundwater heated b a nearby body of magma rises to surface and collects in a natural pool
 * Geothermal Energy:** Clean, dependable energy source given by water heated by magma

How Magma Reaches The Earth's Surface

 * Lava begins as magma in mantle
 * Magma forms in asthenosphere, which is under great pressure
 * Magma Rises**
 * Liquid magma is less dense than surrounding solid material
 * So magma flows upwards into any cracks in rocks above until it reaches surface
 * It can also get trapped beneath layers of rock
 * A Volcanoe Erupts**
 * Dissolved gases trapped in magma are under extreme pressure
 * Like carbon dioxide in soda bottle
 * As magma rises toward surface, pressure decreases.
 * Dissolved gases begin to seperate out, forming bubbles
 * Volcano erupts when an opening develops in the weak rock on surface
 * During volcanic erruption, gases rush out, carrying magma with them
 * Once magma reaches surface and becomes lava, gases bubble out

Inside A Volcano
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 * All volcanoes have a pocket