презентация Environmental contamination
People have always polluted their surroundings. Automobiles and other new inventions make pollution steadily worse. Scientists and engineers can find the ways to reduce pollution from automobiles and factories. Factories pollute the air and the water.
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| Рубрика | Экология и охрана природы |
| Вид | презентация |
| Язык | английский |
| Дата добавления | 25.01.2012 |
| Размер файла | 1,0 M |
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