Because it doesn’t exist in any sort of “lake-like” opening that leaves an empty space if you pump it all out.
Oil, for example, is just tiny droplets that fill in pores on rocks deep beneath the surface.
This is a real oversimplification, but imagine filling up a bucket with marbles. Then add water. If you were to then extract the water from the bucket, the marbles aren’t going to collapse in on each other because the water only occupied vacant space in the first place.
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