C.K.K.K.+3.2

toc =**Section 2 (3-2) Volcanic Activity**=

**Vocabulary**
magma chamber- a hole under volcano where the magma is stored. pipe- a tube which the magma flows. vent- a big hole on volcano where the lava comes out. crater- a bowl around the vent which is formed by the explosion of gas. silica- material formed from oxygen and silicon. pahoehoe- a kind of lava which moves quickly like liquid, hot lava. When it hardens, it looks like it had been folded and/or squashed.00 aa- a kind of lava which moves slow, and cooler than pahoehoe. When it hardens, the surface is rough. pyroclastic flow- active- dormant- extinct- hot spring- geyser- geothermal energy-

**Outline**

 * How Magma Reaches Earth's Surface**
 * Lava is magma which got out of Earth's surface.
 * Magma is first formed in asthenosphere, where it is under great pressure.
 * Magma Rises
 * Liquid magma is less dense from surrounding soil.
 * Liquid magma flows upward into cracks above until it reaches the surface, or gets trapped beneath the layers of rock.
 * A Volcano Erupts
 * Dissolved gas gets trapped in magma under a great pressure.
 * The eruption occurs when an opening develop on the surface.
 * When magma reaches the surface, gases bubble out.
 * Inside a Volcano**
 * All volcanoes have magma chamber beneath them or near them.
 * In the magma chamber                                                                                                            there are some cracks which magma made to force its way.