It doesn’t even need to be dripping directly onto the surface. I’ll give you an example: I’ve seen A/C condensate water coming out of the roof drains of a building, and you can see a clear path where the water eroded away the cement, leaving the concrete’s aggregate exposed. I know water can do some impressive things, (Grand Canyon) but how does the water flowing over the surface actually cause erosion? Let’s say the gutter of a roof is allowed to drip onto a concrete surface, how exactly does it wear it away give enough time?
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Water is the (almost) universal solvent. More substances dissolve in water than in any other chemical. It’s beyond an ELI5, but it has to do with the charges on the H2O molecule being able to disassociate lots of stuff.
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