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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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How to write administrative letters
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أدوات الموضوع | انواع عرض الموضوع |
2009-09-29, 16:02
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رقم المشاركة : 1 | ||||
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 How to write administrative letters
Good morning everybody
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 أفضل جواب - كتبه the moon
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Some causes of soil pollution: * Runoff from pollutants (paint, chemicals, rotting organic material) leaching out of landfill * Polluted water discharged from factories * Oil and petroleum leaks from vehicles washed off the road by the rain into the surrounding habitat * Chemical fertilizer runoff from farms and crops * Acid rain (fumes from factories mixing with rain) * Sewage discharged into rivers instead of being treated properly * Over application of pesticides and fertilizers * Purposeful injection into groundwater as a disposal method * Interconnections between aquifers during drilling (poor technique) * Septic tank seepage * Lagoon seepage * Sanitary/hazardous landfill seepage * Cemeteries * Scrap yards (waste oil and chemical drainage) * Leaks from sanitary sewers Some effects of soil pollution: * pollution runs off into rivers and kills the fish, plants and other aquatic life * crops and fodder grown on polluted soil may pass the pollutants on to the consumers * polluted soil may no longer grow crops and fodder * Soil structure is damaged (clay ionic structure impaired) * corrosion of foundations and pipelines * impairs soil stability * may release vapours and hydrocarbon into buildings and cellars * may create toxic dusts * may poison children playing in the area Cause of Soil Pollution Soil can become contaminated in many ways. Chemicals, like herbicides and pesticides, are major polluters; oil dumps, landfills, and industrial wastes can also wreak havoc. But how do these chemicals and oils get into open spaces far away from industrial sites and dumps? Let’s take a plot of land in Anywhere, USA, as an example. This land houses a small stand of trees, a nice meadow, and a small creek. Long before it reaches our plot, though, the creek runs beneath a hill by a factory. When it rains, water carries factory waste down the hill and into the creek, which carries it to our plot. In addition, there’s a farming operation a hundred miles away from our plot. The farmers use pesticides to protect their crops. However, some of the pesticides evaporate when temperatures rise; the next rainfall brings those chemicals to our plot as acid rain. Effects of Soil Pollution As you can see, pollutants can impact soil everywhere. And the effects are potentially disastrous: small chemical changes in soil can render an area inhospitable to plants, virtually eliminating the food chain’s foundation. Also, chemicals that runoff through soil into rivers and streams can contaminate drinking water. For farmers, pollutants can reduce crop yields and lead to heavy erosion. Read more: https://www.brighthub.com/environment...#ixzz0fjvwYE6a What Can We Do to Help? So what can you do? Most importantly, recycle. The less trash we put out, the less chance that trash will end up in our soil. If you’re a gardener, use environmentally-friendly insect control methods. And, if you can, buy organic food that wasn’t grown using harmful pesticides. It’s hard to worry about the soil’s health as new factories, highways, and buildings go up, but it deserves some serious consideration. Read more: https://www.brighthub.com/environment...#ixzz0fjw4B2RP you can google everything !! |
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2009-10-01, 09:15
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بالتوفيييييييق |
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2010-02-10, 23:22
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MR: …………. |
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2010-02-11, 09:16
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اقتباس:
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2010-02-11, 23:36
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you are always welcome |
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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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