1. Global Winds & Ocean Currents
8.10A recognize that the Sun provides the energy that drives convection within the atmosphere and oceans, producing winds and ocean currents.

2. Warm Up 1 “What causes the wind?”
In your Science Journal, answer the question:
“What causes the wind?”
Quickly find a partner that is not at your table & take turns sharing your explanations.
Together, select the explanation you both think is the most accurate.
Share with the class!

3. Convection Currents in Air
Draw the set-up and make and complete a table in your Science Journal:
Observation
Inference
I notice that…..
I think……because……..
When the light is turned off, I predict….

4. transfer of heat by the movement of warmed matter
CONVECTION
transfer of heat by the movement of warmed matter

5. Hot Air is Less Dense!

6. Force = Mass X Acceleration
increase
increase
Gravity pulls with more force on
heavier objects!
The Bigger They Are, The Harder They Fall!

7. What is most dense SINKS!
Atmospheric Density
What is most dense SINKS!

8. What Can Convection Do?

9. CONVECTION

10. CONVECTION
Moves air in the atmosphere!

11. CONVECTION
Wind over the shore changes direction because of EARTH’S UNEVEN WARMING & COOLING!

12. What Causes Wind?
Bill Nye’s Explains Wind in 2 minutes!
Bill didn’t use the word “convection”… but he described it!
How did he demonstrate convection?

13. What About Convection in Water?
Water and air are both fluids.
They both move due to convection!
Just like air, when liquid water is heated, it expands, becomes less dense, and rises.
Side note: Water is different, however, because of it’s unique structure as a solid. Ice is actually less dense than liquid water whereas other substances are most dense as solids!

14. CONVECTION IN LIQUIDS!

15. causes deep ocean currents!
CONVECTION
causes deep ocean currents!

16. CONVECTION DEMOS! Tea Bag “Rocket” Colored Water
Colored Water

17. Convection causes the rise and fall of air in the atmosphere…
Global Winds
Convection causes the rise and fall of air in the atmosphere… v
But what causes the other patterns (easterlies, westerlies, etc) in the global winds?

18. Jet Streams

19. Global Wind Pattern Challenge!
If you wanted to fly a hot air balloon around the world in the shortest amount of time, which route would you take?

20. Coriolis Effect
Why do the arrows face the opposite way in the Northern and Southern Hemisphere?

21. Coriolis Effect
YouTube: Coriolis Effect

22. LAB: Convection In a Cup
For each test, draw and record your observations!

23. Ocean Currents and Coastal Temperatures

24. Inland vs. Coastal Cities

25. Ocean Currents BrainPop: What is the name of this current?
What is the name of this current?
It carries warm water from the
Gulf of Mexico!

26. Why aren’t there straight lines between the temperature zones?

27. Coriolis Effect… again!
The direction of surface ocean currents affected by the Coriolis effect!

28. Ocean Currents