Continuing my current science bender, a piece of reblogging from Barista on Marie Tharp, Cartographer, scientist, one of those people who seem to confound easy categorisation, and in doing so make intellectual leaps that change the world.
As details of the ocean floor emerged, Tharp noticed a fascinating feature. A well-known mountain range running down the Atlantic, known as the Mid-Atlantic Ridge, appeared as expected. But as Tharp’s careful drafting made clear, there was also a valley that ran down through the middle of the mountain range. It was a hugely important geophysical feature; this “rift valley” marked a dynamic seam in the crust of the planet, the boundary of huge continent-size plates where new portions of crust rose from the interior of the earth to the surface like a conveyor belt and then, in a geological creep known as “drift,” moved outward in both directions from the midocean ridge.