11.1

Fresh Water

100

•What percentage of Earth's water is fresh water?

3%

200

•What percentage of Earth's water is available as surface fresh water?

0.4%

300

•Where is most fresh water found?

•In glaciers, polar ice, or underground

Salt Water

100

•What is salinity?

•The amount of dissolved salt in water

200

•Why do people float easily in the Dead Sea?

•Because the water is very dense from salt

300

•What is the average salinity of ocean water?

3-4%

Desalination

100

•What is desalination?

•Removing salt from water

200

•Why is desalination expensive?

•It requires a lot of energy

300

Name one renewable energy source used in desalination?

•Solar or geothermal energy

Vocabulary

100

•What does concentration mean?

•Amount of solute in a solution

200

•Which type of water is denser: fresh water or salt water?

•Salt water

300

•What is density?

•How much matter is packed into a space