Question

What is the Mojo layer inside the earth? How far down is it inside the earth?

Answer 1

The Moho, for Mohovorovicic Discontinuity, is the boundary between the crust and the upper mantle. On average it's about 35 km deep under the continents, 5-10 km under the oceans.

Explanation:

The Moho was discovered, via seismic wave measurements, by Croatian scientist Andrija Mohorovicic in 1909.

See below for a contour map of the depth of the Moho.

Source:

https://en.m.wikipedia.org/wiki/Mohorovi%C4%8Di%C4%87_discontinuity#

The map is linked to a Wikipedia article.