Ice Wall

This is a wall all around the known Earth. It serves to keep water and sometimes air within the disc. Despite the name it is not composed of purely frozen water.

Location and Formation
Particularly in models with universal acceleration, the wall is at the rim of the Earth and was formed by the accelerator pushing water and particles of dust upwards.

In other models the wall simply marks the border to where humans have travelled, and there may well be other lands beyond it. In this situation it forms naturally, being so far from the Sun that everything freezes.

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