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When does a volcano occur?
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22 votes
When does a volcano occur?

User Yagmurdursun
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19 votes
Volcano occurs when magma rises
User Anthony Nichols
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11 votes

Deep within the Earth it is so hot that some rocks slowly melt and become a thick flowing substance called magma. Since it is lighter than the solid rock around it, magma rises and collects in magma chambers.

User Twoflower
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