## Activity
### 10.13
- Sit in small groups.
- Discuss the various ways of energy conversion in nature.
- Discuss following questions in your group:
(a) How do green plants produce food?
(b) Where do they get their energy from?
(c) Why does the air move from place to place?
(d) How are fuels, such as coal and petroleum formed?
(e) What kinds of energy conversions sustain the water cycle?