What are tectonic plates?

Tectonic plates are indeed sections that make up Earth's crust. The Earth's lithosphere, which includes the crust and the uppermost part of the mantle, is divided into several large and small tectonic plates that float on the semi-fluid asthenosphere beneath them. These plates are continually moving, albeit very slowly, and their interactions can cause geological phenomena such as earthquakes, volcanic activity, and the formation of mountains.

Understanding tectonic plates is crucial because their movement and interaction explain many surface processes and geological events on Earth. This concept is foundational in geology and helps illuminate why certain regions are prone to seismic activity or why specific landforms exist.

The other options do not accurately describe tectonic plates, as water layers, land divisions, and rock types pertain to different aspects of geography and geology. Thus, recognizing the structure and function of tectonic plates is essential for comprehending many Earth processes.