2. Moving ___________ is called wind.

3. A wind can push with very strong _____________.

4. Wind can _____________ over large trees.

5. The force of wind is used to turn the sails of a ________.

6. In the past, windmills were used to grind ___ into flour .

7. Windmills are sometimes used to pump__________.

8. Some modern windmills produce _______________.

9. The windmills that produce electricity is called ___________

10. The wind pushes against the sails of the ___________.

11. A hot air balloon is very _____________

12. A hot air balloon does not have _____________

13. The first windmills were built in ____________.

14. Which of the following object can be moved by wind.

15. Identify the name of instrument.

16. The _______________ measures speed of the wind.

17. Identify the name of the instrument.

18. A wind vane is instrument that shows the _____________ of wind.

19. The harder the wind blows, the ___________ the cups turn.

20. Identify the direction of wind by looking at the picture.