Plate Tectonics is the theory that proposes that Earth's outer shell consists of individual plates that interact in various ways and thereby produce earthquakes, volcanoes, mountains, and the crust itself. Plate Tectonics Theory is the upper most mantle, along with the overlying crust, behaves as a strong, rigid layer, this layer is known as the lithosphere.
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Evidence that supports Plate Tectonics Theory is paleomagnetism, earthquake patterns, ocean drilling, and hot spots.
Some of the strongest evidence in support of the theory of plate tectonics comes from studying the magnetic fields surrounding oceanic ridges. Oceanic ridges are underwater mountain ranges that contain a rift down their center where magma seeps up, forming new oceanic crust.
Most earthquakes and volcanoes happen where scientists believe plate boundaries are.
There was an ocean drilling project designed to analyze the ocean floor. The task was to drill down into the ocean floor and extract samples of the ocean sediments and underlying oceanic crust. It had been theorized that the creation of the oceanic ridge system was caused by seafloor spreading, which states that new oceanic crust is constantly being formed due to the upwelling of magma through diverging tectonic plates.
According to the plate tectonic theory, the Earth's rigid outer layer, or "lithosphere," consists of about a dozen slabs or plates. The Hawaiian islands move across the hot spot because the tectonic plates are moving under it.
Continental Drift is the THEORY that all the continents were once connected but then drifted apart to create separate landmasses. The Plate Tectonics Theory is the theory that proposes that the tectonics plates interact to form earthquakes, mountains, etc. the plates make up the outer shell of Earth.