Introduction -- The voyage of HMS Challenger -- Coral reefs : rainforests of the sea -- Probing the seafloor -- Nothing beats a map -- Do seafloors spread and continents drift? -- Continental drift to plate tectonics -- Hotspots in the mantle -- When the Mediterranean dried up -- The glacial theory -- The astronomical pacemaker -- Astrochronology -- Crater of doom -- The hot, deep biosphere -- The seventh continent -- Eocene doomsday -- Human evolution -- Looking back and ahead.