acidification: when acidic compounds like sulfur dioxide and nitrogen oxides are released into the atmosphere in concentrations high enough to be toxic to plants, animals, and microorganisms. This usually occurs through burning fossil fuels or other industrial processes. (some wording stolen from Casper, some other stolen from e.campusontario.pressbooks.pub)
eutrophication: occurs when a body of water receives an excessive nutrient load, particularly phosphorus and nitrogen. This often results in an overgrowth of algae. As the algae die and decompose, oxygen is depleted from the water, and this lack of oxygen in the water causes the death of aquatic animals, like fish. (via usgs.gov) sources: runoff, sewage, industrial discharge (via Casper’s notes)