Oblique Shape of Continental Block Boundary

One can easily notice that the shape of continental blocks is often oblique = not perpendicular to the surface. Have a look at the scheme:

Expansion.

As the Earth expands, the hot basalts are ‘pushed’ to the surface. And thus the blocks logically ‘wear out’ from the bottom, which is leading to typical oblique shapes at the block/oceanic lithosphere boundaries.

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