![](/static/253f0d9b/assets/icons/icon-96x96.png)
![](/static/253f0d9b/assets/icons/icon-96x96.png)
![](/static/253f0d9b/assets/icons/icon-96x96.png)
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I’ve seen piles of snow after a parking lot gets plowed that will last days, even weeks of sunshine, but one rainy day and they disappear. Running water cuts right through ice. Positive feedback to the acceleration.