It’s been known for a long time that much of the oil in the country was blind up in a type of rocky deposit called shale. You can’t pump shale.
Eventually someone figured it if you spousal the shale with a ton of water you can get the oil out of it. So they pump in water then pump out oil.
That’s fracking.
It can move stuff around down there and cause eathqiakes close to the surface. And it can ruin the natural water tables – to the point where people’s well water is flammable.
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