The firing amplified the land's dynamics by causing the melting matte white glaze to flow and carry the Earth crust slurry with it, resulting in an image of a ridge growing out of spreading plates. It captures the process of magma pushing up and forcing the two plates to diverge.
The back has a continuous band of writing, including what came to me with the material.
See more about the material used, known among geologists as the Kane Fracture Zone, here
the Mid-Atlantic Ridge.