“It never stops moving around the world. It edges its way slowly down from the polar region, and some of it forms into ice. Some of it gets saltier and colder and starts to sink. The water that sinks into the deep cold makes its way south along the ocean floor, through the black twelve thousand feet down. It reaches the Southern Ocean and grazes the icy water from the Antarctic, and then it gets flung across into the Pacific and the Indian. Slowly it thaws, warmer and warmer and rising to the surface. And then at last it turns for home. North again, all the way to the mighty Atlantic. Do you
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