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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.
Tectonic plates are pieces of Earth's crust and uppermost mantle, together referred to as the lithosphere. The plates are around 100 km (62 mi) thick and consist of two principal types of material: oceanic crust (also called sima from silicon and magnesium) and continental crust (sial from silicon and aluminium).hese seven plates comprise the bulk of the continents and the Pacific Ocean. For purposes of this list, a major plate is any plate with an area greater than 10 million km 2. 1  Pacific Plate â 103,300,000 km 2. 2  North American Plate â 75,900,000 km 2.