1. Ocean Water vs Fresh Water

2. Ocean Water vs. Fresh Water
Three ways in which fresh water differs from ocean water are:
Salinity
Density
Freezing point

3. Salinity
The amount of salt dissolved in a specific amount of water.

4. Where Does The Salt Come From?
* salt comes from dissolved solids in the ground and volcanoes.

5. Fresh Water
tiny amounts of salt.
Salt Water
Average is 35 ppt.
Varies depending on location.

6. How Does Location Affect Salinity?
Salinity increases at the equator. Why?
Salinity increases near the North and South Poles. Why?
Salinity is lower near the continents than in the middle of the ocean. Why?

7. Dissolved Solids in the Ocean

8. 2. Density The amount of mass of a substance in a certain unit volume.
How tightly packed together the material is in a substance.

9. Ocean water is more dense than fresh water due to the salt content.
Floating in the Dead sea is easy because it is 9 times saltier than Ocean Water.
The Dead Sea

10. 3. Freezing Point The temperature at which a liquid freezes.
Fresh water... 0oC
Salt water oC

11. The End

12. Why Does Salinity Increase Near the Equator?
Due to the high evaporation rate of the water

13. Why Does Salinity Increase Near the North and South Poles?
when water freezes and changes to ice, it leaves the salt behind

14. Why Is Salinity Lower Near Continents?
due to rivers emptying into the oceans and diluting the salt water
Lena river (Russia) empties into the Arctic Ocean
Mississippi river emptying into the Gulf of Mexico

15. Assignment
Fresh water from rivers mixes with salt water when the river reaches the ocean.
Write a paragraph (1/2 page) predicting whether the the fresh water mixes completely with, floats above , or sinks below the ocean water.
Support your prediction from what you have learned in today’s class.

16. Where Do Canadian Rivers Go?