Answer:
Think of a rock mountain actually more like a sponge. A sponge seems like it fills with water perfectly evenly, but when you zoom in if you were to fill a sponge certain holes would fill faster than other ones. There are little pockets of water in the side of the mountains. Sometimes the entire mountain is full of water, but oftentimes there’s just a little pocket where it collects before pressure or gravity causes it to flow down to the next little pocket. A spring is just tapping into one of those pockets.
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