Don't really know much about it, but a lot of current oil pumping involves putting water and special sand down into the rock layers, to force the oils up and out.
So, kinda doing what you say.
A few billion barrels of oil is a drop in the bucket, not noticeable compared to the oceans and water available on this planet.
A lot of the sink holes come from limestone regions, where water over time carries away the limestone, as it very very slowly erodes from the underground water.
In certain cases underground mining and oil drilling clearly has caused the ground to cave in, of course. But most of what you hear is from limestone. If you see that house that is in the news, falling in a river, some speculate that an underground sprinkler system was enough to wet through and crack the limestone under the house.... Tho, to most of us it just looks like bad planning!
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Today's Featured Article - Harvestin Corn in Southern Wisconsin: The Early Years - by Pat Browning. In this area of Wisconsin, most crops are raised to support livestock production or dairy herds in various forms. Corn products were harvested for grain, and for ensilage (we always just called it 'silage'). Silo Filling Time On dairy farms back in the 30's and into the first half of the 40's, making of corn silage was done with horses pulling a corn binder producing tied bundles of fresh, sweet-smelling corn plants, nice green leaves with ear; the
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