oxygen (o) 15.999 and silicon (sl) 28,088
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Oxygen
Silicon and calcium
silicon
silicon
the solid Earth,Earth's oceans,Earth's atmosphere, andorganisms on Earth
The two elements that commonly occur within the earth crust are Oxygen and Silicon.
Iron, nickel, and small amounts of lighter elements.
Earth would have to be the hardest of the Aristotelean Elements as it is the only solid one.
Yes, chemical elements can move through all of these reservoirs as part of the Earth's biogeochemical cycle: I. the solid Earth, II. Earth's oceans, III. Earth's atmosphere, and IV. organisms on Earth. Each reservoir plays a role in storing and exchanging elements through different processes like weathering, erosion, biological uptake, and volcanic activity.
Of the 92 elements from hydrogen to uranium 90 of them are present in some amount in the crust of the earth. Trace amounts of plutonium and other transuranics are also present.
Oxygen, Silicon, Calcium, Magnesium, sodium