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| Requests Section Requests for translation and research papers... |
في حال وجود أي مواضيع أو ردود
مُخالفة من قبل الأعضاء، يُرجى الإبلاغ عنها فورًا باستخدام أيقونة
( تقرير عن مشاركة سيئة )، و الموجودة أسفل كل مشاركة .
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أدوات الموضوع | انواع عرض الموضوع |
2013-03-09, 21:53
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رقم المشاركة : 1 | ||||
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 project on ethnography
السلام عليكم
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 أفضل جواب - كتبه ayoub dz benaissa
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many kinds of pollution that make life difficult, unhappy and unhealthy. the first kind is the most dangerous one which is air pollution . it is caused by factories and cars sending out smoke. this kind is commonly found industrial and big cities. in such cities ,air is not clean and unhealthy. the other kind is water pollution .factories pour chemicals into nearst seas and rivers. it is also caused by tankers spilling oil or towns pouring waste. those poisonous chemicals and waste make water dirty and unhealthy to drink . they also kill fish that people eat. many countries work hard to stop pollution and thy cucceeded. air and water on their cities become much cleaner. they now breathe and drink fresh and healthy air and water. Pollution is the introduction of contaminants into an environment that causes instability, disorder, harm or discomfort to the physical systems or living organisms they are in.[1] 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. |
| الكلمات الدلالية (Tags) |
| ارجوكم, عاجل |
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المشاركات المنشورة تعبر عن وجهة نظر صاحبها فقط، ولا تُعبّر بأي شكل من الأشكال عن وجهة نظر إدارة المنتدى
المنتدى غير مسؤول عن أي إتفاق تجاري بين الأعضاء... فعلى الجميع تحمّل المسؤولية
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