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UNIT 2: Natural Resources - UGC

event took place - life began on our planet. The crust of the earth is 6 or 7 kilometers thick and lies under the continents. Of the 92 elements in the lithosphere only eight are common constitu-ents of crustal rocks. Of these constituents, 47% is oxygen, 28% is silicon, 8% is aluminium, 5% is iron, while sodium, magnesium, potassium

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  Unit, Resource, Natural, Planet, Unit 2, Natural resources

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