Air, water and soil as necessity for existence of all living things. Importance of solving the environmental problems that endanger people's lives. Water and air pollution. Pesticides, rubbish and poison-beware. Reduction of pollution. Drainage systems.
08.01.2011 |
Ecology |
Иностранные языки и языкознание |
Язык: английский |
Просмотры: 95
