LPKW+3.1

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=3.1 Volcanoes and Plate Tectonics=

Vocabulary

 * volcano**-a weak spot in the crust where magma comes to the surface
 * magma**-a mixture of molten material or rock
 * lava**-when magma reaches the surface, it is called lava
 * Ring of Fire**-made by volcanos forming along the Pacific coast
 * island arc**-made when a string of volcanos make a row of islands
 * hot spot**-a area where molten magma melts through the crust

Outline

 * **What is a volcano?**
 * a volcano is where a weak spot in the crust has been melted by magma
 * when magma cools it hardens to rock, making a cone like a mountain
 * **Location of volcanoes**
 * There are about 600 active volcanoes in the world
 * somtimes they make a huge belt like the Ring of Fire