Ozone
The ozone layer protects the Earth's surface from harmful ultraviolet radiation; however, the presence of ozone near the surface is dangerous.
Хими
7 – 12-р анги
Бичсэн: Vámos-Poljak Zsolt
Хянан шалгагч: Horváthné Kunstár Andrea
График дизайнер: Molnár Mónika
Түлхүүр үгс
mozaLink
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