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Mountains Formed by Magma

Mountains Formed by Magma
Reading Level
     edHelper's suggested reading level:   high interest, readability grades 6 to 8
     Flesch-Kincaid grade level:   5.41

Vocabulary
     challenging words:    divergent, mid-ocean, tectonic, northwestern, intrusion, magma, extremely, trapped, lava, mountainous, volcanic, mantle, dome, molten, crust, such
     content words:    Mount Saint Helens, Cascade Range, United States, Adirondack Mountains, New York, Hawaiian Islands, Saint Helens, Black Hills, South Dakota

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Mountains Formed by Magma
By Patti Hutchison 		  
1     You have probably heard of Mount Saint Helens. This mountain is part of the Cascade Range in the northwestern United States. You know that these mountains were formed by magma. But did you know that the Adirondack Mountains in New York were also formed by magma?
 
2     Volcanic mountains are formed when magma erupts onto earth's surface. Many of these mountains are found along mid-ocean ridges. These are divergent boundaries where tectonic plates are spreading apart.
 
3     As the sea floor spreads apart, magma moves upward to fill the space. It cools and forms mountains. As the eruptions continue, the mountains grow taller. Huge mountain ranges are formed under the ocean.

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