Which element is most common in a) in the earth’s crust b) in the hydrosphere c) in the atmosphere d) in space.

a) Oxygen. Its content in the earth’s crust is 46.6%.
b) Oxygen. Its content in the hydrosphere is 89%, since water makes up 71% of the earth’s surface.
c) Nitrogen. Its content in the atmosphere is 78.09%.
d) Hydrogen. Its content in space reaches 90%, since it makes up the bulk of cosmic bodies.



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