This boundary is characterized by a sharp increase in seismic wave velocity, indicating a change in the composition and density of the Earth's layers.
Here's a breakdown:
* Crust: The outermost layer of Earth, composed primarily of lighter elements like silicon, aluminum, and oxygen.
* Mantle: The layer directly below the crust, composed of denser, heavier minerals like iron and magnesium.
The Moho marks the transition from the relatively light and rigid crust to the denser and more plastic mantle.
Key characteristics of the Moho:
* Seismic discontinuity: Seismic waves travel faster through the denser mantle, creating a distinct boundary detectable by seismographs.
* Depth variation: The Moho's depth is not uniform. It is generally deeper beneath continents (35-40 km) than beneath oceans (5-10 km).
While the Moho is a significant boundary, it's important to note that it's not a sharp, distinct line. Rather, it's a gradual transition zone where the properties of the crust and mantle gradually change.
