Pollution is the introduction of a contaminant into the environment.
Pollution is caused by industrial and commercial waste, agriculture practices, human activities and transportation.
It is created by human actions and by natural disasters. For example, earthquake is a natural disasters.
The consequences of pollution, for man, are asthma, cancer and allergies, illnesses and diseases.
The different types of pollution are: land pollution, air pollution and water pollution. Air is a pollutant because there are human activities and greenhouse. Air is composed of O2, N2, CO2 and other pollutants gases (sulphur oxide, nitrogen oxide,...).
Land pollution is the contamination of the land surface and soil. The main cause of land pollution is the effects of chemicals contained in herbicides and pesticides. Pollutants of water are especially industrial water waste, the petroleum and the acid rain.