eli5 Why is Fracking fluid returned to the hole after extracting the resources?
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After you’ve pulled a bunch of liquid out of the area, you need to re-introduce a similar amount of liquid to avoid instability.
The oil wells aren’t exactly bottles filled with oil that we then empty out, but the analogy is pretty good. There’s space where there wasn’t space before, even if it’s not *really* a gaping void.
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