And this metaphorical sponge you speak of is essentially a subduction zone where the crust of the earth of one tectonic plate is forced under another. And the squeezing of the sponge that occurs along rift zones creates the molten rock where the gold scattered about the Earth is liquified and pools in together, because all of Earth's gold is of extraterrestrial origin that was accreted in the Earth's crust during its formation.
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