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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.
Crustal plates form the outer layer of the Earth. There are seven major plates and many smaller plates. These tectonic plates are formed from the Earth's crust and uppermost part of the mantle. Types of tectonic plates. There are two types of tectonic plates.