Answer:
Continental lithosphere is thicker than oceanic lithosphere
Step-by-step explanation:
The continental crust is formed essentially of aluminous silicates (that is why it was formerly called sial) and has an overall composition similar to that of granite. It measures 25 to 50 km thick and the primary seismic waves propagate at 5.5 km / s.
The oceanic crust is composed essentially of basalt, formed by magnesian silicates (hence the formerly called sima). It is 5 to 10 km thick and is denser than the continental crust because it contains more iron. Seismic waves have a speed of 7 km / s.