2-3

The 3 major sources of water pollution are:

1.) human wastes 2.) industrial wastes 3.) chemical runoff

How many sources are there

2

How many major sources of water pollution are there

3

How many pollution from sewage are there

3

Rain washes chemicals away as runoff. This is a nonpoint source of pollution. Fertilizers runoff into lakes and ponds speeds up the process of eutrophication. Pesticide runoff can cause harm to harmless insects and other animals in ponds. Runoff from roads can deliver gasoline, oils, and salts into our rivers, lakes, and groundwater. These are nonpoint sources of pollution.

Chemical Runoff

Toxic chemicals and acids.

Chemicals

Many pollutants are removed from fresh water through natural cleanup processes. Living things in lakes, streams, and wetlands help reduce pollution by filtering out and breaking down waste materials. Some plants can absorb metal and chemicals. Certain bacteria are used to cleanup toxic chemicals and oil spills. Artificial wetlands have been created near coal mines to treat acidic mining runoff.

Cleanup

Some pollutants can build up in the bodies of living things. Over a long time, certain pollutants can build up levels that cause birth defects or illnesses such as cancer. Ex: Pesticides Pesticides- Chemicals intended to kill insects and other organisms that damage crops. DDT is a pesticide that has caused much harm to animals. The 3 major sources of water pollution are: 1.) human wastes 2.) industrial wastes 3.) chemical runoff

Effects of Pollutants

Water Pollution- The addition of any substance that has a negative effect on water or the living things that depend on the water. Pollutants- The substances that cause water pollution. Sources of pollution are classified by how they enter a body of water. 2 sources: 1.) point source- A specific source of pollution that can be identified. Ex: a pipe leaking polluted wastes. 2.) nonpoint source- A source of pollution in which the source cannot be identified. Ex: A leaky waste tank underground.

Freshwater Pollution

Heated water from factories that is released into rivers or ponds raises the water temperature, sometimes enough to harm living things.

Heat Pollution

Some bacteria, viruses, and parasites live in human wastes and can get into a water supplies. Heavy rains can cause sanitary sewers to overflow and pollute water. Wastes from farm animals can be a problem in rural areas.

Human Wastes

Pollution from factories and mines is a more serious problem than pollution from sewage. 3 types: 1.) Chemicals- Toxic chemicals and acids. 2.) Smoke and Exhaust- Factories burn fuel or coal & from engines or vehicles. The burning of coal, oil, and gasoline, release sulfur dioxide and nitrogen oxide into the air. When these mix with water, the result is acid rain. Acid rain kills fish and wildlife, harms trees, and eats away stone on buildings. 3.) Heat Pollution- Heated water from factories that is released into rivers or ponds raises the water temperature, sometimes enough to harm living things.

Industrial Wastes

Chemicals intended to kill insects and other organisms that damage crops.

Pesticides

The substances that cause water pollution.

Pollutants

Industries use recycling techniques to reduce pollution. Factories cool the water used to cool machinery and reuse it instead of releasing it into a river. This reduces heat pollution. Industries are using fewer toxic chemicals. Some farmers plant fields of grasses that filter out pollutants from runoff. People are making efforts to dispose of wastes properly instead of dumping them into the ground and down drains.

Prevention

Factories burn fuel or coal & from engines or vehicles. The burning of coal, oil, gasoline, release sulfur dioxide and nitrogen oxide into the air. When these mix with water, the result is acid rain. Acid rain kills fish and wildlife, harms trees, and eats away stone on buildings.

Smoke and Exhaust

The addition of any substance that has a negative effect on water or the living things that depend on the water.

Water Pollution

In the late 1960's, people and government created laws to cleanup and reduce pollution. Governments also now monitor and enforce water-quality standards and the cleanup of waste disposal sites. Solving pollution problems involves cleaning up existing problems as well as preventing new ones.

Water Pollution Solutions

A source of pollution in which the source cannot be identified. Ex: A leaky waste tank underground.

nonpoint source

A specific source of pollution that can be identified. Ex: a pipe leaking polluted wastes.

point source