NOTECARDS

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Earth's atmosphere
Nitrogen(n) and Oxygen(O)
Earth's crust
Oxygen(O), Silicon(Si), and Aluminum(Al)
Earth's mantle
Silicon(Si), Oxygen(O), and Iron(Fe)
Earth's core
Iron(Fe) and Nickle(Ni)
Earth's oceans
Hydrogen(H) and Oxygen(O)
Living things
Carbon(C), Hydrogen(H), Oxygen(O), Phosphorous(P)
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