SOLAR SYSTEM

Detailed explanation-1: -The seafloor spreading hypothesis was proposed by the American geophysicist Harry H. Hess in 1960.

Detailed explanation-2: -Which concept is described in the theory proposed by Hess? Mid-ocean ridges are sites of seafloor spreading.

Detailed explanation-3: -In this classic paper, Hess outlined the basics of how seafloor spreading works: molten rock (magma) oozes up from the Earth’s interior along the mid-oceanic ridges, creating new seafloor that spreads away from the active ridge crest and, eventually, sinks into the deep oceanic trenches.

Detailed explanation-4: -Harry Hess was a geologist and Navy submarine commander during World War II. Part of his mission had been to study the deepest parts of the ocean floor. In 1946 he had discovered that hundreds of flat-topped mountains, perhaps sunken islands, shape the Pacific floor.