define hydrogen cycle
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Definition of hydrologic cycle :-
the sequence of conditions through which water passes from vapor in the atmosphere through precipitation upon land or water surfaces and ultimately back into the atmosphere as a result of evaporation and transpiration. — called also hydrological cycle.
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the transmission of hydrogen from water to carbohydrates etc and back to water by living organisms. the electrolysis or solar photolysis of water to give hydrogen and oxygen which are then recombined in a fuel cell to produce electricity is known as hydrogen cycle
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