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2015-02-10T20:38:50+08:00

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They let enrich the soil to help the plants grow healthy and they can make new landforms.
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2015-02-14T14:49:44+08:00
They give us rocks classified as Igneous rocks. Some rocks that are Igneous are Basalt, Obsidian and Pumice. They are so full of gas bubbles, that they float on water
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