2. What is the process of recycling waste for reuse called?

3. Which tree is a symbol of Russia?

4. What percentage of Earth's water is drinkable?

5. Which animal is an indicator of clean water?

6.Which material takes the longest to decompose?

7.What is the phenomenon of rising global temperatures called?

8.Which animal is the loudest on Earth?

9.Which energy source is considered the most eco-friendly?

10.Which international day is dedicated to environmental protection?