JBTC3.1

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Notes 3.1

 * volcano** - a weak spot in the crust where molten material comes to the surface
 * magma** - a molten mixture of some rock-forming elements, vapor(gas), and water
 * lava** - magma that reaches the surface
 * island arc** - volcanoes that create a stream of island
 * hot spot** - an area where "deep" magma in the mantle melts through the crust
 * Ring of Fire** - one major volcanic belt

What Is A Volcano?

 * volcano
 * magma
 * lava