eli5 why are most natural holes circles?
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Nature doesn’t like corners. If you are digging a hole to stay in, generally you want to be able to turn around inside it. Animals don’t want to expend energy to dig out corners that aren’t needed.
Natural forces follow the same principle. Erosion follows the path of least resistance, which leads to slopes and curves where the water continues to flow.
In the cases where you have a large amount of force, (think earthquakes or icebergs) nature will push through in whatever shape its in, leaving straighter lines.
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