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Volcanoes
Types of Magma

Volcanoes
Volcanoes


Types of Magma
Print Types of Magma Reading Comprehension


Reading Level
     edHelper's suggested reading level:   high interest, readability grades 7 to 8
     Flesch-Kincaid grade level:   8.13

Vocabulary
     challenging words:    andesite, andesitic, viscosity, viscous, greatly, igneous, resistance, soupy, basalt, violent, dormant, granite, explosive, composition, magma, resistant
     content words:    Hawaiian Islands, Yellowstone National Park, Saint Helens, Washington State


Types of Magma
By Patti Hutchison
  

1     Magma is soupy mixture of molten rock, minerals, and gases. But not all magma is the same. Different magmas have different characteristics. The way a type of magma behaves depends on what it is made of.
 
2     There are three basic types of magma. Each is formed in a different way. Each is found in a different area. The viscosity and temperature of each varies greatly. Their mineral compositions are also very different.
 
3     One type of magma is basaltic magma. Basaltic magma has the same composition as the igneous rock, basalt. This type of magma has a low percentage of silica. It is high in iron and magnesium. It has very few gases dissolved in it. It is formed when rocks in the upper mantle melt.
 
4     Basaltic magma is hottest of the three types. Its temperature ranges from 1000 to 2000 degrees Celsius. This high temperature affects basaltic magma's viscosity.

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