Continental Drift

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crust is formed of 13 continental plates. The boundaries of the zones are where tectonic activities occur, and where earthquakes and volcanic eruptions tend to happen. The plate tectonics theory was thought up in the 1960s and 1970s, with ideas taken from Wegener’s earlier thoughts. Earlier, Wegener and other scientists had noted that continental crust grows by additions and that a ridge in the middle of the ocean runs almost all the way around the world. It was also noted that continental plates tear apart, drift apart, and collide with each other.
Seafloor Spreading Geophysicists, mapping the ocean floor with an instrument that measures magnetic fields, showed that the rocks on one side of the midocean ridge produced an opposing image geomagnetic pattern of the rocks on the other side. When they dated these rocks, it showed that those nearest the ridge is obviously younger than those farther away are. They came to the conclusion that the midocean ridge is where new ocean ...

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