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I've never heard about this possibility before, but it just came up in my mind when I posted the pic about that massive sinkhole.

I've never heard about this possibility before, but it just came up in my mind when I posted the pic about that massive sinkhole.

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Satellite geo surveys do not show any large voids in the plates. The magma underneath is molten, so any voids in the magma layer would be quickly filled. When a fissure opens in a plate, it is quickly filled with magma. If it reaches the surface, we get a volcanic eruption.