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Anything toxic can cause ground water contamination if poured on the ground.
The substance in ground water might cause the water to have an unpleasant odor is "Sulfur".
no
ground water can cause erosion through chemical weathering
YES
The ground is saturated. Any more water will run off and could cause flooding of the surrounding land.
Dew, which is the condensation of water droplets on the ground.
Precipitation will cause erosion. If you are counting collection as part of the water cycle, that can cause erosion, too, as the water moves over the ground.
small like poo
One cause of acidic ground water is polluted rain water, which can be acidic.
they squiggle their way through water/ground etc.
Ground water contamination.