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Tectonic plates are large plates of rock that make up the foundation of the Earth's crust and the shape of the continents. The tectonic plates comprise the bottom of the crust and the top of the Earth's mantle.There are ten major plates on Earth and many more minor ones.ectonic plates are large plates of rock that make up the foundation of the Earth's crust and the shape of the continents. The tectonic plates comprise the bottom of the crust and the top of the Earth's mantle. There are ten major plates on Earth and many more minor ones.
Plate Tectonics. Plate tectonics is the theory explaining the motion of the outer crust or the lithosphere of earth. Lithosphere is divided into tectonics plates. Two main types of tectonics plates are the oceanic crust and continental crust.Oceanic crust is mainly composed of Silicon and magnesium, hence called SIMA.ontinental Drift vs Plate Tectonics. Continental drift and plate tectonics are two theories explaining the geological evolution of the earth, specifically its crust. Continental Drift. Continental drift is a theory first presented by Abraham Ortelius (Abraham Ortels) in 1596.