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The portion of the Earth that is broken into tectonic plates is the? The portion of the Earth that is broken into tectonic plates is the Lithosphere. It's not one solid sheet but broken into slabs called plates. They are in motion and â¦ drift over the asthenosphere. It's a lot like a slab of ice drifting over the surface of a lake.
The major tectonic plates on Earth are the Pacific Plate, the Indo-Australian Plate, the North American Plate, the Eurasian Plate, the African Plate, the South American Plate â¦and the Antarctic Plate. Please also see the related question. 14 people found this useful.