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How are volcanoes constructive vs. destructive?

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1 vote
When volcanoes erupt they bring molten magma from inside the earth creating new land masses. for example most island are created from volcanoes 
User Akash Kava
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They are constructive forces because if it is destructive it would be like weathering or erosion. Volcanos is a construction of a new landform. 
User Yaoyao
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