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Volcanoes

Volcanic Material

Volcanic Material
Reading Level
     edHelper's suggested reading level:   high interest, readability grades 6 to 8
     Flesch-Kincaid grade level:   5.74

Vocabulary
     challenging words:    pyroclastic, silica, poisonous, long-term, Dark-colored, explosive, billowy, boulders, violent, debris, explosion, lava, material, responsible, diameter, volcano

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Volcanic Material
By Patti Hutchison 		  
1     A volcano erupts. Debris is thrown high into the air. It forms a billowy cloud that can travel for miles. What is all this material that spews from the vent of a volcano?
 
2     There are several types of material that spill from a volcano. Solid particles are called tephra. This material is made of rock fragments. It can come from several sources.
 
3     Tephra can be pieces of hardened lava. It can be mineral grains or pieces of the cone. These particles are classified by size.
 
4     The smallest pieces of tephra are called volcanic dust. The particles have a diameter less than .25 millimeters. It is a very fine material, almost like powder.

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