Final answer:
Industrial waste disposal and agricultural runoff are two significant human activities that contribute to water pollution, affecting regions like the Amazon Basin and resulting in detrimental impacts on water quality and ecosystem health.
Step-by-step explanation:
Two human activities that can cause water pollution are industrial waste disposal and agricultural runoff, especially in the region of the Amazon Basin. Industrial waste can contaminate water bodies with chemicals, heavy metals, and other toxic substances.
Agricultural activities contribute to water pollution through the runoff of fertilizers and pesticides, which contain high levels of nitrogen that can lead to eutrophication and harmful algal blooms. These pollutants can create 'dead zones' and affect the water quality for both human consumption and aquatic life.