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Solution: The crust (upper part) of the earth has been formed out of seven major and some minor plates. These are called tectonic plates. A Tectonic plate (also called lithospheric plate) is a massive, irregularly shaped slab of solid rock, generally composed of both continental and oceanic lithosphere.olution: The northern plain has been formed by the interplay of the three major river systems, namelyâ the Indus, the Ganga and the Brahmaputra along with their tributaries. This plain is formed of alluvial soil.
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.