Imagine a gigantic bowl of ceramic, filled completely with a sponge. The sponge represents the dirt under your feet. Even though it is solid for us, it is still porous enough to let water seep.through it, similiar to a sponge. The bowl of ceramic represents a layer of, for example, clay or bedrock, which does not allow for any, or only minimal amounts, water to pass through. So it keeps raining and raining on the sponge, and it keeps soaking up water.
When you drill or dig a hole down to make a well, you are creating an empty space into which water sloooowly seeps from the surrounding sponge.
Also, in case ur curious about “what if the sponge cant take any more water?” Well, it just runs off on the surface. This is actually one of the major challenges of modern cities, all the ground is paved or otherwise compacted and doesnt allow any water to seep.into.it, so it runs off on the surface instead, which can quickly cause minor flooding
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