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the process during which nitrogen gas is converted into substances that can be used by plants, like ammonium and nitrate ions.
horizontal tunnels that are dug from the working shaft to the ore body in a mine.
a chemical reaction in which a substance reacts to form two or more simpler substances.
the natural process in which carbon circulates though an ecosystem.
types of chemical âunitsâ â could be atoms, molecules, molecular fragments, simple or...