Choose the correct option A, B or C.
11. Green products are aimed at
12. Grass roofs have been used
13. On the grass roof, soil or crushed stones are laid directly on top of
Complete the notes below. Write NO MORE THAN TWO WORDS for each answer.
14.
15.
16.
17.
18.
Choose TWO letters A-E. Which TWO methods for encouraging people to install grass roofs are mentioned?