RHNC+3.2

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 * 3.2 Volcanic Activity**

Vocabulary

 * Magma Chamber**-pocket with lava under volcano
 * Pipe-**tube that connects magma chamber to volcano
 * Vent-**opening in volcano where gas and magma come out
 * Lava flow-**the area covered by lava that comes out of the vent.
 * Crater-**bowl shaped area at top of volcano
 * Silica-**material formed from oxygen and silicon
 * Pahoehoe-**a fast moving hot lava.
 * Pyroclastic flow-**occurs when an explosive eruption hurls out ash,cinders,and bombs as well as gases.
 * Active-**live volcano
 * Dormant-**sleeping volcano
 * Extinct**-dead volcano
 * Hot spring-**ground water heated by magma below
 * Geothermal energy-**energy from hot spring

How Magma Reaches Earth's Surface

 * Magma Rises
 * A Volcano Erupts

Inside a Volcano

 * magma chamber
 * pipe
 * lava Flow
 * crater

Characteristics of Magma

 * silica

Types Volcanic Eruptions

 * Quiet Eruptions
 * Pahoehoe
 * aa
 * Explosive Eruptions
 * pyroclastic flow

Stages of a Volcano

 * active
 * dormant
 * extinct

Other Types of Volcanic Activity

 * hot springs
 * geothermal energy

Volcano Hazards

 * Mudflows