<em>The major boundaries of the Earth's interior were discovered by seismologists. In 1909, Andrija Mohorovičić, a Croatian seismologist, discovered the boundary between the crust and the mantle by observing the sudden increase of seismic waves as they passed from the crust to the mantle.</em>
Th theory of Plate Tectonics provide an explanation for natural occurring phenomena such as earthquakes, the making of mountains and volcanoes and even the creation of tsunami's
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