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Lecture Starts: 22:55

The Oceans of Our Planet, Part 1

Lesson 01: MNotes01-1a

1. How many large ocean basins are there in the world? ______________

2. The 4 large ocean basins of the world are the ______________ Ocean, the ______________ Ocean, the ______________ Ocean, and the ______________ Ocean.

3. The part of the earth's crust that is covered with ocean is made up of ______________ crust.

4. The oceanic crust is composed mainly of ______________, which is relatively dense solidified lava.

5. The ______________ crust is the part of the earth's crust that is not covered with ocean.

6. The continental crust is composed mainly of ______________, which is less dense than the crust under the ocean.

7. The crusts float on the earth's ______________.

8. The slow-flowing material that makes up the mantle is called ______________ rock because it sometimes behaves like liquid and sometimes behaves like solid.

9. Scientists hypothesize that all the continents of the world were once part of a large super-continent called ______________.

10. The plates of the earth's crust are believed to have drifted to their present locations via a process known as plate ______________. The movement of the continents to their present locations is also known as continental ______________.

11. The two types of geological structures where two plates meet are (1) a ______-______________ ridge system and (2) a ______________ system.

12. In a mid-ocean ridge system, two plates move away from each other via the process called _______________ _______________.

13. In a trench system, two plates move towards each other, one dipping down into the mantle. This process is called ______________.

14. The geologic activity most commonly found around ______________ systems is in the form of earthquakes.

15. The geologic activity most often found around trench systems is in the form of ______________.

16. Oceanic crust formation mostly occurs in the ______________ Ocean where there is a large mid-ocean ridge. Oceanic crust is destroyed mostly in the ______________ Ocean where there are more numerous deep ocean trenches.

17. The gently sloped shallow section of the edge of a continent is called the ______________ shelf. This location is where most ocean life is found.

18. The shelf break is located at the point where the slope of the bottom begins to become ______________.

19. True or False: The continental slope is found in Sun Valley, Idaho and is a favorite winter skiing slope. ______________

20. The ______________ plain is the deepest region of the seafloor.

21. The major property of water that keeps its molecules together is ______________ bonding. This creates a flexible “skin” at the water's surface called ______________ tension.

22. Water naturally exists on earth in three phases:

(a) ______________ – in the form of ice or snow

(b) ______________ – in the form of water

(c) ______________ – in the form of water vapor.

23. When water freezes it becomes _________ __________, allowing solid water to float on liquid water.

24. Water has a high ______________ heat; therefore, it does not change temperature very quickly despite drastic air temperature changes.

25. True or False: Water is often called the universal solvent because it can dissolve more substances than most other liquids. ______________

26. Seawater consists of pure water with materials dissolved in it. The solids in seawater come from the ______________ of rocks and ______________ vents.

27. ___________________ is a measure of the total amount of salt dissolved in a solvent.

28. ______________ will result in greater salinity of the water left behind.