Crustal thickness is a key aspect of understanding the structure and composition of the Earth's crust. It refers to the distance between the Earth's surface and the Moho discontinuity, which marks the boundary between the Earth's crust and the underlying mantle. Understanding crustal thickness is important for a variety of reasons, including determining the tectonic processes occurring within the Earth's crust, the distribution of earthquake activity, and the formation of mountain ranges. Researchers use a variety of methods, such as seismic imaging and gravity measurements, to study crustal thickness and gain insight into the geological processes that shape the Earth's surface.