1. Why is it important to protect the quality of the Earth's fresh water supply?

2. What places on Earth have a water shortage and why?

3. What could people do to have more water in places where there is a shortage?

4. Describe latent heat

5. What is distillation?

6. Explain the law of energy conservation.

1. Living things consist of water and need it to survive.

2. Deserts because the water is evaporated.

3. Use rain barrels, and other water conservation methods.

4. The heat required to convert a solid into a liquid or vapor, or a liquid into a vapor, without a change in temperature.

5. The action of purifying a liquid by a process of heating and cooling.

6. Law stating that the total energy of an isolated system remains constant, and is conserved over time; energy cannot be created or destroyed, but can be transformed or transferred from one form to another.