بسمة أيمن مشرف نشيط
عدد المساهمات : 793 العمر : 25 العمل/الترفيه : طالبة فصل : 6\1 e3dady المزاج : :'( مزاجي اليوم : المهنة : الهواية : أوسمة العضو : نقاط : 24299 السٌّمعَة : 44 تاريخ التسجيل : 06/12/2008
| موضوع: pollution الخميس أبريل 02, 2009 11:31 pm | |
| [ Pollution is the introduction of contaminants into an environment that causes instability, disorder, harm or discomfort to the ecosystem i.e. physical systems or living organisms . Pollution can take the form of chemical substances, or energy, such as noise, heat, or light energy. Pollutants, the elements of pollution, can be foreign substances or energies, or naturally occurring; when naturally occurring, they are considered contaminants when they exceed natural levels. Pollution is often classed as point source or nonpoint source pollution. The Blacksmith Institute issues annually a list of the world's worst polluted places. In the 2007 issues the ten top nominees are located in Azerbaijan, China, India, Peru, Russia, Ukraine and Zambia.
Water pollution is the contamination of water bodies such as lakes, rivers, oceans, and groundwater caused by human activities, which can be harmful to organisms and plants that live in these water bodies
Air is the ocean we breathe. Air supplies us with oxygen, which is essential for our bodies to live. Air is 99.9% nitrogen, oxygen, water vapor and inert gases. Human activities can release substances into the air, some of which can cause problems for humans, plants, and animals. There are several main types of pollution and well-known effects of pollution, which are commonly discussed. These include smog, acid rain, the greenhouse effect, and "holes" in the ozone layer. Each of these problems has serious implications for our health and well-being as well as for the whole environment. One type of air pollution is the release of particles into the air from burning fuel for energy. Diesel smoke is a good example of this particulate matter. The particles are very small pieces of matter measuring about 2.5 microns or about .0001 inches. This type of pollution is sometimes referred to as "black carbon" pollution. The exhaust from burning fuels in automobiles, homes, and industries is a major source of pollution in the air. Some authorities believe that even the burning of wood and charcoal in fireplaces and barbeques can release significant quantities of soot into the air. Another type of pollution is the release of noxious gases, such as sulfur dioxide, carbon monoxide, nitrogen oxides, and chemical vapors. These can take part in further chemical reactions once they are in the atmosphere, forming smog and acid rain. Pollution also needs to be considered inside our homes, offices, and schools. Some of these pollutants can be created by indoor activities such as smoking and cooking. In the United States, we spend about 80-90% of our time inside buildings, and so our exposure to harmful indoor pollutants can be serious. It is therefore important to consider both indoor and outdoor air pollution. | |
|
mariam mahmoud عضو فعال
عدد المساهمات : 379 العمر : 25 العمل/الترفيه : طالبة المزاج : زهققققققققققققققانة مزاجي اليوم : المهنة : الهواية : أوسمة العضو : نقاط : 23509 السٌّمعَة : 21 تاريخ التسجيل : 20/01/2009
| موضوع: رد: pollution الجمعة أبريل 03, 2009 7:45 am | |
| الموضوع حلو يا بسمة شكرا علي المعلومات المفيدة | |
|
hadeer hany مشرف فعال
عدد المساهمات : 856 العمر : 25 الموقع : http://zohor-mostaqble.ahlamontada.com العمل/الترفيه : طالبة المزاج : HAPPY مزاجي اليوم : المهنة : الهواية : أوسمة العضو : نقاط : 24018 السٌّمعَة : 14 تاريخ التسجيل : 02/04/2009
| موضوع: رد: pollution الثلاثاء سبتمبر 01, 2009 3:30 am | |
| الموضوع جميل جدا بس انتى ليه حطاه فى الدرسات | |
|