Other
The National Academies of Sciences, Engineering, and Medicine: Project Mohole
Project Mohole was "the earth sciences' answer to the space program," a project to gain information about the Earth by drilling a hole through the Earth's crust to the Mohorovicic Discontinuity (Moho). This website gives a history of the...
National Geographic
National Geographic: Encyclopedia: Mantle
An in-depth look at the structure and composition of Earth's mantle, with lots of visuals. Covers lithosphere, Mohorovicic discontinuity, asthenosphere, transition zone, lower mantle, the d double-prime region, mantle convection, mantle...
Columbia University
Columbia University: Evidence for Internal Earth Structure and Composition
This resource describes how seismic waves have helped us to understand the composition of the Earth's interior. It discusses seismic discontinuities, including the Mohorovicic Discontinuity or Moho, and what we have learned about the...
Other
Geology.com: Mohorovicic Discontinuity the Moho
Explains what the Mohorovicic Discontinuity is, how it was discovered, how deep it is, and why it has not been studied much.