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This chart represents the magnetic alignment of rocks along the sea floor, shown by plotting °W against °N on the axes. A thick central stripe is labelled as being along the crest of the the Mid-Atlantic ridge, and and there are many stripes that run parallel to this. The scale bar on the diagram indicates that the patterns shown here run for hundreds of kilometres along the sea floor.

 1.9 What is plate tectonics? Continental drift and sea floor spreading - part 1