I walked along the beach a few days ago a quarter mile landward of the San Andreas fault zone. Surfers were swimming out and riding the curls back on the west side of San Francisco. Sets picked them up over the Pacific Plate and swept them onto North America. A hundred feet below, the […]
tectonics
Heat rises, cold falls, and like a pan of soup on a hot stove, the earth boils, exceedingly slowly. The boiling is called convection: columns of heat rise from the earth’s hot core, move up through the viscous solidity of the mantle, cool at the crust, roll over and fall back down. The crust that […]