1. Today’s Agenda… 1-20 Bellringer Questions on Review Sheet
Notes on Oceans

2. Ocean Water
Study pack #7

3. Today’s Goals… I can state the importance of Earth’s oceans.
I can discuss the origin of oceans.
I can describe the composition of seawater.
I ca explain how temperature and pressure vary with depth.

4. True or False?? Oceans are used to ship materials around the world.
Most of the oxygen on Earth comes from ocean organisms.
Ancient volcanoes caused the creation of oceans.
There is no oxygen in ocean water
As you go deeper in the ocean, temperature increases.

5. Importance of Oceans Provide a place for organisms to live
Transport seeds and animals across the world
Allow materials to be shipped around the world

6. Importance of Oceans
Provide us with resources like food, medicine, and salt
The water for most of our precipitation comes from evaporation of oceans
70% of oxygen on Earth is given off by ocean organisms

7. Formation of Oceans
As ancient volcanoes erupted they released water vapor into the atmosphere
When the water vapor cooled enough it formed clouds and then precipitation
Water collected in low areas and formed oceans

8. Composition of Ocean Water
Rivers and groundwater dissolve materials from rocks and carry them to the oceans
Erupting volcanoes add other materials
Most abundant elements are sodium and chloride (salt)

9. The Dead Sea

10. The Dead Sea

11. The Dead Sea

12. Dissolved Gases
All of the gases in Earth’s atmosphere are also dissolved in ocean water
Oxygen, carbon dioxide, nitrogen
Organisms in the water also produces gases like oxygen through photosynthesis
Organisms that carry on photosynthesis live near the top to get sunlight

13. Water Temperature and Pressure
The surface layer is warm because it receives the most solar radiation
Temperature decreases as you go deeper
Pressure also increases as you go deeper

14. True or False?? Oceans are used to ship materials around the world.
Most of the oxygen on Earth comes from ocean organisms.
Ancient volcanoes caused the creation of oceans.
There is no oxygen in ocean water
As you go deeper in the ocean, temperature increases.