3. Category 1Category 2Category 3Category 4 100 200 400 300 400 300 200 400 200 100 500 100

4. The source of energy that drives the water cycle. What is the sun? Category 1 Question 5

5. The process of supplying water to areas of land to make them suitable for growing crops. What is irrigation? Category 1 Question 4

6. The process by which plants give off water vapor through their leaves. What is transpiration? Category 1 Question 2

7. A mixture that forms when one substance dissolves into another. What is a solution? Category 1 Question 1

8. The property that allows water to rise up in a narrow tube. What is capillary action? Category 1 Question 3

9. A place where an organism lives. What is a habitat? Category 2 Question 2

10. The process by which molecules at the surface of a liquid absorb enough energy to change to the gaseous state. What is evaporation? Category 2 Question 5

11. When clouds form, condensed droplets of water form around these. What are dust particles? Category 2 Question 4

12. A molecule that has electrically charged areas. What is a polar molecule? Category 2 Question 1

13. The temperature at which water molecules begin to change back to the liquid state. Also, it is the temperature at which water begins to change into its gaseous state. What is 100° Celsius (212° F)? Category 2 Question 3

14. Most water in the atmosphere is invisible and is called this. What is water vapor? Category 3 Question 4

15. Rain, snow, sleet, and hail are forms of this. What is precipitation? Category 3 Question 1

16. The process by which a gas changes to a liquid. What is condensation? Category 3 Question 5

17. A substance that dissolves another substance. What is a solvent? Category 3 Question 2

18. The tightness across the surface of the water. What is surface tension? Category 3 Question 3

19. Category 4 Question 5 Water is the only substance on Earth that commonly exists in all three of these states. What are solids, liquids, and gases?

20. The percentage of water on Earth that is salt water. What is 97%? Category 4 Question 1

21. The water cycle renews this on earth. What is the supply of fresh water? Category 4 Question 2

22. Compared to other substances, water has a high one: The amount of heat that must be absorbed or lost for 1 gram of that substance to change its temperature by 1º C. What is specific heat? Category 4 Question 3

23. This causes raindrops to form round beads when they fall on a car windshield. What is surface tension? Category 4 Question 4