1. Get out your reading guide from 15.2
While I check assignments….
Complete memory clues for the first three words; oceanography, volcanism, and sea level.

2. Ocean/Sea Water Facts How much salt is there? Salinity
3.5% of ocean water is salt
Average
Salt is dissolved in the water
Table-salt
Most abundant
Measure of how many salts are dissolved in sea water.
Can change from place to place
Rain, Melting Sea Ice, Rivers Running into Oceans

3. Where Does the Salt Come From?
Origin
Has of Salt Always Been the Same?
Yes
We can tell by looking at shells of fossilized organisms that used to live there.
Volcanic Gases dissolve in water
Weathering of rocks

4. Why Don’t Our Oceans Get Any More Salty?
Salt is continuously added…
But, salts are also removed at the same rate they are added.
Combine to make other rocks
Washed ashore
Marine Organisms

5. Ocean Water vs Freshwater
Demonstration In Class
More dense then fresh water
Cold water is more dense then warm water
Density = 1.02 g/cm3 – 1.03 g/cm3
Salt water freezes at a lower temperature then freshwater

6. Come up with a memory clue for salinity.
Reflecting Break
Come up with a memory clue for salinity.

7. Ocean Layering Temperature Temperature Profile
Surface temperatures can be very different
-20C around the poles to 300C around the equator
Deep ocean water is always very cold
Shows the changing water temperatures with depth

8. Temperature Profile Temperature Details 1st 100 meters: Surface Layer
Sunlit
Relatively Warm
2nd layer: Thermocline
Transitional Layer
Temperatures Decrease Rapidly With Depth
3rd Layer: Bottom Layer
Cold and Dark
Temperatures near Freezing

9. Cold Water Origin
All of the cold water making up the bottom layer of oceans around the tropics comes from Earth’s polar seas.

10. Come up with a memory clue for Temperature Profile and Thermocline
Reflection Break
Come up with a memory clue for Temperature Profile and Thermocline