WordNet
n. a process existing in or produced by nature (rather than by the intent of human beings); "the action of natural forces"; "volcanic activity" [syn: natural process, action, activity]
Usage examples of "natural action".
Some of this harm might have come from agethe natural action of millennia since this refuge was evacuated.
It was another non-natural action, but she'd watched human females enough to get the general idea.
They're lovely -- titanalloy struts as light and strong as bird bones, tension-compensated wrist-pinion and shoulder joints, natural action in the alula slots, and automatic flap action in stalling.
Each one had a perfect complexion, resulting from the natural action of the water, and their breasts floated somewhat, making them seem fuller.
The natural action of the wind-pressure takes the paper along the string, and so up to the kite itself, no matter how high or how far it may have gone.