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Science Folio Essay Sample

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Science Folio Essay Sample

Air pollution is the introduction into the atmosphere of chemicals, particulates, or biological materials that cause discomfort, disease, death to humans, damage other living organisms such as food crops, or damage the natural environment. The composition of air are nitrogen, oxygen, inert gases and others and carbon dioxide. There are few major air pollutants such as carbon monoxide, sulphur oxides, hydrocarbons and photochemical oxidants. The major effects of air pollutions are greenhouse effect, ozone depletion and also acid rain. All these occur when there are harmful substances in the air.

Composition of air OBJECTIVES

The objectives for completing this folio is to
* Learn more about air pollution
* The causes of air pollution
* The effects of air pollution
* Ways to control and overcome air pollution

CONTENT

The major effect due to air pollution is firstly greenhouse. Greenhouse effect can be defined as a process by which thermal radiation from a planetary surface is absorbed by atmospheric greenhouse gases, and is re-radiated in all directions. Since part of this re-radiation is back towards the surface and the lower atmosphere, it results in an elevation of the average surface temperature above what it would be in the absence of the gases. The sources are from when greenhouse gases trap heat and make the planet warmer. Human activities are responsible for almost all of the increase in greenhouse gases in the atmosphere over the last 150 years. The largest source of greenhouse gas emissions from human activities is from burning fossil fuels for electricity, heat, and also transportation. Below shows the diagram and the process of how greenhouse effects occurs.

Second major effect caused by air pollution is thinning of ozone layer which is well known as Ozone depletion. The ozone layer is a region in the stratosphere, between 17 and 25 km above the earth’s surface. The ozone layer contains high concentration of ozone molecules, that absorb ultraviolet radiation and shield organisms from its damaging effects

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