the Moho

The Moho, short for the Mohorovičić discontinuity, is the boundary that separates Earth's crust from its underlying mantle. It is characterized by a sudden increase in seismic wave speeds, indicating a transition from less dense rocks to denser, mantle materials. This boundary is typically found at depths ranging from about 5 to 70 kilometers beneath the Earth's surface, depending on whether it is under oceanic or continental crust. The Moho is crucial for understanding Earth's internal structure and helps scientists study the processes that shape our planet's geology.