Slabs are flat, thick pieces of material, often made from concrete, stone, or wood. They are commonly used in construction for flooring, countertops, and outdoor patios. The size and thickness of slabs can vary, depending on their intended use and the load they need to support. In the context of geology, slabs can refer to large sections of the Earth's crust that move and interact with each other. This movement is part of the plate tectonics theory, which explains how the Earth's surface is shaped by the shifting of these massive slabs over time.