Agriculture can decrease the quality of Earth's groundwater in these three ways:
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Animal waste - Animal waste can introduce pathogens, nutrients, and harmful chemicals into groundwater, leading to contamination.
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Pesticides - The use of pesticides in agriculture can result in these chemicals leaching into groundwater, causing pollution and potential harm to human health and ecosystems.
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Sedimentation - Soil erosion from agricultural practices can lead to increased sedimentation in water sources, which can degrade water quality and aquatic habitats.
Rainwater usage is generally not a direct cause of groundwater quality degradation.