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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.
Geologists have an explanationâa scientific theoryâof how the Earth's surface behaves called plate tectonics. Tectonics means large-scale structure. So plate tectonics says that the large-scale structure of the Earth's outer shell is a set of plates. (see the map) Tectonic Plates. Tectonic plates don't quite match the continents and the oceans on the Earth's surface. The North America plate, for instance, extends from the west coast of the U.S. and Canada into the middle of the Atlantic Ocean.