Who knows but if our instruments were delicate enough we might detect an undulation in the crust of the earth?

The distribution of the mass of the atmosphere over the surface of the earth is also controlled by the relief of the crust, its greater or lesser density at the surface corresponding to the lesser or greater elevation of the surface.

The primary distinction of the forms of the crust is that between elevations and depressions.

The - - study of tidal strain in the earth's crust by Sir George Darwin has led that physicist to indicate the possibility of the triangular form and southerly direction of the continents being a result of the differential or tidal attraction of the sun and moon.

Directly the crust was pierced the whole mass was shattered into minute fragments.