RLAF+3.2

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Volcanic Activity
Vocabulary: **magma chamber-**beneath a volcano, magma is collected into a pocket
 * pipe-**the magma moves through a long tube in the ground that connects the magma chamber through earth's surface
 * vent-**molten rock and gas leave the volcano through an opening
 * lava flow-**an area covered by lava as it pours out of the vent
 * crater-**a bowl-shaped area that may form at the top of a volcano
 * silica-**a material that is formed from the elements of oxygen and silicon
 * Pahoehoe-**fast moving hot lava
 * aa-**lava that is cooler and more slower-moving
 * pyroclastic-**flow occurs when an explosion eruption hurls out ash,cinders,bombs,and gas
 * active-**a live or occurs a lot
 * dormant-**a sleeping or dozing object
 * extinct-**dead,something unlikely to happen
 * hot spring-**forms when ground water heated by a nearby body of magma
 * geyser-**a fountain of water and steam that erupts underground
 * geothermal** **energy-**a clean,reliable energy source

Outline

 * How magma reaches earth's surface**
 * lava
 * begins as magma in mantle
 * magma forms in athenosphere
 * Magma Rises**
 * liquid magma
 * not very dense
 * rises from volcano
 * A Volcano Erupts**
 * dissolved gas
 * trapped in magma
 * carbon dioxide
 * can't see it
 * pressure
 * when released, carbon dioxide forms bubbles
 * Inside A Volcano**
 * Volcanoes
 * have a pocket
 * beneath surface
 * called magma chamber
 * Magma
 * moves through a long tube
 * called pipe
 * Inside volcanoes
 * have vents
 * lets magma pour
 * Characteristics of Magma**
 * Magma
 * thick
 * thin
 * temperature
 * hot and burning
 * Silica
 * helps magma burn