Britannica
Sources used in this answer
- water pollution: Top Questions
- water pollution - Domestic sewage
- hydrosphere - Impact of human activities on the hydrosphere
- water pollution - Petroleum (oil) pollution
- river - Environmental problems attendant on river use
- Agricultural technology - Agricultural processing wastes
- Agricultural technology - Plant nutrients
- hydrologic sciences - Water quality
How have fertilizers, pesticides, sewage, petroleum, and industrial waste polluted the hydrosphere?
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hydrosphere
Earth's environment includes the atmosphere, the hydrosphere, the lithosphere, and the biosphere.
Human activities significantly degrade the hydrosphere by introducing pollutants that disrupt natural ecosystems and threaten public health.123
- Fertilizers: Agricultural runoff containing nitrates and phosphates promotes excessive algal blooms. As these algae decompose, they deplete dissolved oxygen, leading to eutrophication and the creation of oxygen-deficient "dead zones" where aquatic life cannot survive.456
- Pesticides: These toxic chemicals enter water systems through runoff and seepage. They can poison aquatic organisms directly and accumulate in the food chain, posing long-term health risks to humans.25
- Sewage: Untreated domestic sewage introduces pathogenic microorganisms that cause disease, as well as organic matter that consumes oxygen during decomposition.45
- Petroleum: Oil pollution from spills and surface runoff coats water surfaces, harming marine life and damaging coastal habitats.17
- Industrial Waste: Facilities discharge toxic chemicals, heavy metals, and heated water. These substances can alter water acidity, poison organisms, or deplete oxygen, often persisting in the environment for decades.153