Plate Tectonics Theory Grant Petersen

What is the Plate Tectonics Theory?

The Plate Tectonics Theory is the theory that Earth's outer crust is divided into several plates that glide over the Mantel.

What is The Difference between the plate tectonics theory and continental drift?

Plate Tectonics involves the Earths plates which consist of the Continents and the ocean floor. Alfred Wegener's Continental Drift only involves the Continents moving.

Evidence that proves the plate tectonics theory:

Paleomagnetism:

Paleomagnetism is the study of the earth's past magnetic field. Paleomagnetism is one of the strongest pieces of evidence to support Plate Tectonics. Evidence has shown, for example, that some rocks in Alaska have magnetic minerals oriented in such a way that they must have been laid down at or near the equator.

Earthquake Patterns:

Earthquakes are most common above boundaries between the tectonic plates. If a map is taken and then earthquake patterns marked on it, the clear shapes of the tectonic plates can be seen.

Ocean Drilling:

The drills brought back rocks from the bottom of the ocean that we had no way of accessing before. Scientists used radioactive dating to figure out how long ago the rocks formed. They eventually realized that the further you go away from the mid-ocean ridge , the older the rocks get. So the Atlantic Ridge is formed from new rock under the Mantel.

Hot Spots:

Hot spots occur within tectonic plates and leave behind a chain of extinct volcanoes.

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Grant P
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