Protecting the waters
Drinking water comes from surface and underground water sources. This is one of the reasons why you should not pollute the natural environment.
01:41
Природни науки
5 – 10. клас
Ключови думи
mozaLink
/Линк
Drinking water comes from surface and underground water sources. This is one of the reasons why you should not pollute the natural environment.
01:41
Природни науки
5 – 10. клас
Ключови думи
mozaLink
/Линк