Elements in Nature(Ch.22)
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Hydrogen
Most abundant element in the universe
Iron
Most abundant element in the whole earth
Oxygen
Most abundant element on the earth's crust
Aluminum
Most abundant metal on the earth's crust
Oxygen
Photosynthesis caused its presence in our atmosphere
Helium
Second most abundant element in the universe
Silicon
Second most abundant element on the earth's crust
Iron
Second most abundant metal on the earth's crust
Oxygen and Silicon
Together they comprise 4 out of 5 atoms near the earths surface
