There are two classifications of watershed pollution, point source, and nonpoint source. With pollution, the source of chemicals

There are two classifications of watershed pollution, point source, and nonpoint source. With pollution, the source of chemicals or other is readily apparent, such as a treatment plant or a factory that releases directly into the water. With pollution, no single source is evident, but still exist, such as or pet waste running off from into storm drains.

*point source
*non-point source
*Water pollution
*suburban yards

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  1. B.Nonpoint sources of pollution are responsible for around 40% of river, lake and estuary pollution in the United States.


    Water pollution or water pollution is a modification of water, usually caused by human beings, which makes it improper or dangerous for human consumption, industry, agriculture, fishing and activities, as well as for animals.

    Although water pollution can come from natural sources, such as the ash from a volcano, most of the current pollution comes from human activities.

    The development and the industrialization suppose a greater use of water, a great generation of waste, many of which go to stop to the water and the use of means of fluvial and maritime transport that in many occasions, cause of pollution of the waters by your oil or fuel. Surface water is generally more vulnerable to anthropogenic pollution than groundwater, due to its direct exposure to human activity. On the other hand, a surface source can be restored more quickly than an underground source through seasonal runoff cycles. The effects on quality will be different for lakes and reservoirs than for rivers, and different for aquifers of rock or sand and sand gravel.

    The presence of pollution generates what are called "forced ecosystems", that is, ecosystems altered by external agents, deviated from the situation of previous equilibrium forced to modify their operation to minimize the tension to which they are subjected.

  2. Non point source pollution can include: Excess fertilizers, herbicides and insecticides from agricultural lands and residential areas. Oil, grease and toxic chemicals from urban runoff and energy production. Sediment from improperly managed construction sites, crop and forest lands, and eroding stream banks.


  3.  b)  the number of sources of pollution


    Pollution is the introduction of harmful or toxic substances in the environment of a substance.

    Point source pollution is the pollution from a single identifiable source. Example of a point source pollution is pollutants from factories and sewage treatment plants.

    Non point source pollution is from a number of sources and we may not identify all of the sources.Thus non point pollution is also termed as diffused pollution. Example of a non point source pollution is fertilizers and pesticides from agricultural lands.


  4. 1. Emmisions: gases and particles which are put into air or emitted by various sources

    2. Carbon monoxide: a colorless, odorless has that forms when fuels are not completely burned.

    3. Nonpoint source: a source that is widely spread and cannot be tied to a specific origin, such as vehicle emissions.

    4. Point source: a specific source of pollution that is easy to identify, such as a smokestack.

    5. Temperature inversion: occurs when a layer of warm air prevents the riding air from escaping. The polluted air is trapped and held close to Earth's surface

    6. Smog alert: a warning about a certain type of air pollution called photochemical smog.

    7. Radon: a colorless, odorless gas that is radioactive and is formed naturally by certain rocks underground

  5. Option D point source pollution

    Explanation: The pollutants which can be tracked, from the source of origin are termed as point source pollution. This can be water source, air or even light or noise pollution. The pollutants are easily detected being released from the source of pollution. Whereas the non-point source of pollution are those which are indirect sources and they carry off the pollutants which lie on the way, like runoff water carrying the pesticides from the agricultural land. Runoff and waste are examples of non-point sources of pollution. Thus, option A and C are incorrect answers.

  6.  b. the number of sources of pollution

    The point source pollution can be defined as the pollution whose source of origin can be traced back and the further pollution can be prevented. For example sewage drainage in the pond. The non-point source pollution is the one whose source of origin can be many and cannot be traced back to a single source. For example rain water causing surface runoff which is transferring pesticides, organic matter, sewage water in the water body.

    The principle difference between point source and nonpoint source water pollution is the number of sources of pollution. In the point source pollution the number of sources of pollution can be determined and traced back whereas in the nonpoint source pollution number of sources of pollution remains undetermined.

  7. 1. The correct answer is I and II only. The increase in population leads to a bigger pollution in water due to the cycle it follows (being used by humans to their living processes, excrements, etc), the air gets more polluted due to the respiratory chain (more production of Carbon dioxide) and  by transportation which use fossil fuels and produce harmful gases and also the noise increases because of the industries, cars and even  conversation comes to a higher level in quantity and volume.

    2. An effective component to create a more sustainable environment would be the reduction of fossil fuels usage, because they produce carbon dioxide and other toxic gases. Pollution regulations should be kept or strenghthened, birth rates should be kept to a balanced rate, plastic bags shall be reduced to a minimum because the time demanded to be decomposed is longer than  paper ones and importing food staples from other countries does not make a sustainable environment.

    3. An indirect source of pollution is  placing an online order for a CD to be shipped from another state. That is so because the ship will produce pollution to commute from one place to the other as it depends on fuel to work.

    4. A good policy to make a relatively poor nation more sustainable would be the offer of financial incentives for limiting family size. That is so because birth rates are usually very high in poor nations. As known, the bigger the number of citizens, the lower the conditions for well being and health we may have. By limiting the birth rate, the government would have to invest less in social policies (health insurance, security and education) which cost the most.

    5. The answer is D. That is so because the industrial revolution made people migrate to the cities to get work, which made the number of population rise. After that period the number fell because of diseases, high birth growth and people who died or returned to their origin places.

    6. The type of society that has the greatest overall impact is the industrial one, because it involves more pollution sources of air, water and noise; more littering and consumerism of the sources available in the area.

    7. The aspect of society that more contributed to the plague was the high population density. Once one person was sick and there were no appropriate conditions for living, such as potable water, hygiene and healthy food, as well as the lack of space to segregate sick ones, the plague quickly spread all over, contaminated and killed many.

    8. The answer is letter E. As a consequence of the bad results of industries, the population learns how to deal with challenges related to pollution and migration increases. As a consequence of this increase, families grow, as birth rates raise and there´s a big boom of new-borns.

    9. A water system is more likely to be contaminated by point source pollution when farmers spray their fields with chemical pesticides, which seep through the soil and into the groundwater supply. That is so because these chemicals demand long time to be biodegradated and also because the contamination of freatic/ water  streams is so serious cause the chemicals get spread from underground and spred very fast.

    10. The best sentence to describe the "Tragedy of the commons" is that faced with threats to the environment, some people willingly sacrifice individual rights for the benefit of society. Once the community needs to be preserved it´s mandatory that the group´s interests come above all the individuals rights.

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