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What are the hollow spaces in the Earth's crust?

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Ehmm.. what spaces are you on about? There are caves if that is what you mean. Caves commonly form when soil contains elements that can easily erode chemically, like calcium that can be washed out with water. read more

Hollow spaces, such as caves, appear because of geological processes. They don’t have a “purpose”, any more than gravity or wind or the sea have a purpose. Looking for purpose in the blind operations of the universe will lead you into error. read more

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