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Volcanoes

Intruding Magma

Intruding Magma
Reading Level
     edHelper's suggested reading level:   high interest, readability grades 5 to 7
     Flesch-Kincaid grade level:   5.22

Vocabulary
     challenging words:    cubic, uplift, erosion, intrusion, extremely, magma, mantle, seep, violent, within, surrounding, upward, earth, amount, travels, lies

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Intruding Magma
By Patti Hutchison 		  
1     Processes deep within our earth help shape the surface we live on. You know that magma is formed in the lower mantle, deep under the crust. This molten rock is less dense than the solid rocks that surround it. Because of this, magma is forced to move upward toward the surface. But not all traveling magma reaches the earth's surface. What happens to magma that does not erupt?
 
2     As magma travels up toward the surface, it comes in contact with the rock that surrounds it. This process is called intrusion. An intruder can force his way into your home. In the same way, magma forces its way into the rocks around it.
 
3     When magma intrudes, several things can happen. It can force the rocks of the crust apart. Small cracks called fissures will form in the rocks. The magma can seep slowly into them.

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