Which fact helped the scientists to understand plate movement?

1.	Which fact helped the scientists to understand plate movement?
Answer» Solution :The rocks equidistant on either sides of the crest of mid-oceanic ridges show remarkable similarities in terms of period of formation, chemical COMPOSITIONS and magnetic PROPERTIES. Rocks closer to the mid-oceanic ridges have normal polarity and are the youngest. The age of the rocks increases as ONE MOVES away from the crest.

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