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Ocean Floor Consisted:
This outward movement could push continental blocks apart or push previous ocean Floor rocks beneath the continents, which would explain the comparatively young age of the rocks on the ocean floor. In the Pacific Ocean, for example, the new ocean Floor seems to spread outward from a great ridge known as the East Pacific Rise. As the new Floor moves outward, the older seabed ahead of it should be forced downward into the deep trenches that ring the Pacific Ocean.Their classification, which was developed by the Challenger expedition's geologist John Murray (1841-1914), and others who studied the samples after the ship's return, has been improved but never completely discounted. Even so, the widely prevalent idea that the ocean Floor consisted of a sandy waste extending for thousands of miles, dotted with a few islands and occupied by exotic fish, was gradually discarded.
Assuming that the newly forming crust at oceanic ridges picked up the prevailing polarity signal of the earth's magnetic field, the result over a long period of time would be strips of ocean Floor that were alternately normally and reversely magnetized. The correspondence between the patterns on the ocean Floor and the known history of the earth's magnetic field is too remarkable to be due to chance [4].
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