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| ==Useful links== | | ==Useful links== |
− | * [[Wikipedia:Crust (geology)|Wikipedia article] | + | * [Wikipedia:Crust (geology)|Wikipedia article] |
− | * [http://education.nationalgeographic.com/education/encyclopedia/crust/?ar_a=1 Nat'l Geographic article]] | + | * [http://education.nationalgeographic.com/education/encyclopedia/crust/?ar_a=1 Nat'l Geographic article] |