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Where Did the Oceans Come From?

Where Did the Oceans Come From?
Reading Level
     edHelper's suggested reading level:   high interest, readability grades 6 to 7
     Flesch-Kincaid grade level:   4.97

Vocabulary
     challenging words:    comet, watershed, atmosphere, massive, itself, vapor, volcanic, erupt, crust, possible, source, contain, life, cycle, period, average
     content words:    Southern Oceans, Black Sea, Caribbean Sea, Atlantic Ocean, Pacific Ocean

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Where Did the Oceans Come From?
By Patti Hutchison 		  
1     The oceans have been around almost as long as the earth itself. Did you ever wonder where all that water came from? Scientists have two possible answers for this question.
 
2     One idea is that oceans were formed by comets. A comet is a body made of rock and ice. It orbits the earth. Sometimes they run into the earth. When this happens, water is released. Scientists think that over time, all these collisions filled the oceans.
 
3     Another idea is that ocean water came from deep inside the earth. It was brought to the surface when volcanoes erupted. Scientists think soon after the earth was formed, there was a long period of massive volcanic eruptions.

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