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2014-11-11T18:24:05+08:00

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- It makes soil fertile
- Formation of minerals
- Volcanic materials provide clue about the earth's internal structure

--Mizu
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2014-11-11T18:47:36+08:00
- provide landmasses
-provide surrounding landscape with nutrient enriched  fertile soil
-create new island and lands
-create economic mineral deposit
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