Final answer:
Tectonic plates are the large pieces of the lithosphere that move and interact with each other. They play a significant role in geological processes.
Step-by-step explanation:
The large pieces of the lithosphere are called tectonic plates. These plates are huge segments of the Earth's crust that move and interact with one another. They play a crucial role in the theory of plate tectonics and are responsible for various geological phenomena like earthquakes, volcanic activity, and the formation of mountain ranges.
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