Physical and chemical changes and their effect on human population
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Physical Pollution
Of the different types of pollution, physical pollution may be the most recognizable. Simply stated, physical pollution is the introduction of discarded materials into the environment. Physical pollution is what you might refer to as trash and is the direct result of human actions. In other words, nature does not produce physical pollution because in natural systems, all byproducts or wastes are eventually recycled back into the environment. For example, in nature, a fallen tree will degrade and eventually return nutrients to the soil.
However, physical pollutants, such as discarded water bottles and plastic bags along with waste materials from industrial or manufacturing processes, do not naturally degrade and can accumulate or leach chemicals into the ground or water supplies as they breakdown. Physical pollutants are often sent to landfills, which are designated areas for trash disposal in which the waste is dumped and then covered by soil.
Landfills keep physical pollutants confined to one area, and many modern landfills are lined with layers of clay or plastic to prevent leakage. However, as buried waste products and organic matter decompose, they can release methane gas, carbon dioxide and other gases that are harmful to the environment.
Chemical Pollution
Chemical pollution is another type of pollution. It is defined as the introduction of chemicals into the environment. Chemicals may not be seen by the naked eye, but they can cause problems in all areas of the environment, from the air we breathe to the freshwater we drink to the soil we use for growing crops.
Agricultural practices are one example of a chemical pollution source. Pesticides used to control insects and fertilizers used to make soil more fertile contain nitrogen, phosphorus and other chemicals. These chemicals can run off of a farmer's field and enter waterways. Nitrogen and phosphorus fertilize tiny plant life in the body of water, causing rapid growth and eventually depleting oxygen levels in the water to the point where fish and other species of life cannot survive. Chemical pollution from pesticides and fertilizers can also contaminate soil if used in excess. Other sources of soil contamination include the leaking of chemicals from mines and landfills.
Chemical pollution is also seen in the air. The burning of fossil fuels, such as coal, oil and natural gas, release chemical pollutants into the atmosphere. These fossil fuels may be used in our vehicles or by utilities or industries.
Of the different types of pollution, physical pollution may be the most recognizable. Simply stated, physical pollution is the introduction of discarded materials into the environment. Physical pollution is what you might refer to as trash and is the direct result of human actions. In other words, nature does not produce physical pollution because in natural systems, all byproducts or wastes are eventually recycled back into the environment. For example, in nature, a fallen tree will degrade and eventually return nutrients to the soil.
However, physical pollutants, such as discarded water bottles and plastic bags along with waste materials from industrial or manufacturing processes, do not naturally degrade and can accumulate or leach chemicals into the ground or water supplies as they breakdown. Physical pollutants are often sent to landfills, which are designated areas for trash disposal in which the waste is dumped and then covered by soil.
Landfills keep physical pollutants confined to one area, and many modern landfills are lined with layers of clay or plastic to prevent leakage. However, as buried waste products and organic matter decompose, they can release methane gas, carbon dioxide and other gases that are harmful to the environment.
Chemical Pollution
Chemical pollution is another type of pollution. It is defined as the introduction of chemicals into the environment. Chemicals may not be seen by the naked eye, but they can cause problems in all areas of the environment, from the air we breathe to the freshwater we drink to the soil we use for growing crops.
Agricultural practices are one example of a chemical pollution source. Pesticides used to control insects and fertilizers used to make soil more fertile contain nitrogen, phosphorus and other chemicals. These chemicals can run off of a farmer's field and enter waterways. Nitrogen and phosphorus fertilize tiny plant life in the body of water, causing rapid growth and eventually depleting oxygen levels in the water to the point where fish and other species of life cannot survive. Chemical pollution from pesticides and fertilizers can also contaminate soil if used in excess. Other sources of soil contamination include the leaking of chemicals from mines and landfills.
Chemical pollution is also seen in the air. The burning of fossil fuels, such as coal, oil and natural gas, release chemical pollutants into the atmosphere. These fossil fuels may be used in our vehicles or by utilities or industries.
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Physical changes:
Humans impact the physical environment in many ways: overpopulation, pollution, burning fossil fuels, and deforestation. Changes like these have triggered climate change, soil erosion, poor air quality, and undrinkable water.
chemical changes:
Human exposure to hazardous chemicals can occur at the source or the chemical could move to a place where people can come into contact with it. Chemicals can move through air, soil, and water. They can also be on plants or animals, and can get into the air we breathe, the food we eat and the water we drink.
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