The theory of sea- floor spreading was introduced by Herny Hess in 1960s. Hess came with the idea

800 WordsApr 23, 20194 Pages
The theory of sea- floor spreading was introduced by Herny Hess in 1960s. Hess came with the idea that new oceanic floor formed at the mid oceanic ridges. Ridges is a crack in the earth’s crust through which spreads rock rises to the surface. The Melton rock spreads out and adds new material to the ocean floor. The new materials are carried away from the mid oceanic ridges. Sea floor spreading explains the existence of pillow lava near the ridges and the absence of thick layers of sediments on the ocean floor. In fact, near the ridges, sediment is not found. One of the most important contributions of the theory of sea- floor spreading was that it could explain how continent moved. (Silver Burdelt & Ginn 301-302) Sea- floor…show more content…
If the sea floor spreading is not taking place all rocks found in the oceanic crust they must have same age and structure. Therefore due to the sea- floor spreading made variation of rock from the middle part of oceanic ridge to the part found far away it Formation of new oceanic crust at the mid- oceanic ridge; this also proves the theory of sea- floor spreading at the mid- oceanic ridge. The oldest one must move away from mid oceanic ridge to allow upwelling of molten materials. Molten materials later cool and solidify to form new oceanic crust. At the spreading centre liquid rock called basalt magma rises from the Earth’s mante as it up wells beneath the spreading axis. When the magma hardness it forms crust that becomes welded to the original crust ( Encyclopedia Geology and Oceanograph Accumulation of sediments / Fossil as we look at these deposits- burned fossils and sediments, we will see older and older fossils as we move further and further from the mid- oceanic ridge as the results we will see greatest proportion of extinct species. Also sediments much deposit on the older part of the sea floor for longer than new parts around the mid oceanic ridge. Different sediments tend to accumulate on different parts of oceanic floor if the ocean floor stayed still then the other things being equal, we would expect same deposit of the sediments from any particular place on sea –floor to be pretty much the same all the way down. Sea

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