8.10A recognize that the Sun provides the energy that drives convection within the atmosphere and oceans, producing winds and ocean currents.

Warm Up 1 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!

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….

transfer of heat by the movement of warmed matter

Hot Air is Less Dense!

Force = Mass X Acceleration

Gravity pulls with more force on heavier objects!

increase increase

The Bigger They Are, The Harder They Fall!

Atmospheric Density

What is most dense

SINKS!

What Can Convection Do?

CONVECTION

CONVECTIONMoves air in the atmosphere!

CONVECTIONWind over the shore changes

direction because of

EARTH’S UNEVEN

WARMING & COOLING!

What Causes Wind?Bill Nye’s Explains Wind in 2 minutes!http://www.youtube.com/watch?v=uBqohRu2RRk&feature=related

Bill didn’t use the word “convection”… but he described it!

How did he demonstrate convection?

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!

CONVECTION IN LIQUIDS!

CONVECTIONcauses deep

ocean currents!

CONVECTIONDEMOS!- Tea Bag “Rocket”

http://www.youtube.com/watch?v=UUYV-h1gCJc - Colored Water

http://www.youtube.com/watch?v=G9QJ1vv2WyMhttp://www.youtube.com/watch?v=7xWWowXtuvA

Global Winds

v

Convection causes the rise and fall of air in the atmosphere…

But what causes the other patterns

(easterlies, westerlies, etc) in the

global winds?

Jet Streams

http://www.pbs.org/wgbh/nova/balloon/science/jetstream.html

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?

Coriolis EffectWhy do the arrows face the opposite way in the

Northern and Southern Hemisphere?

Coriolis EffectYouTube: Coriolis Effect

LAB: Convection In a CupFor each test, draw and record your observations!

Ocean Currents and Coastal Temperatures

Inland vs. Coastal Cities

Ocean CurrentsBrainPop:http://www.brainpop.com/science/earthsystem/oceancurrents/

What is the name of this current?

It carries warm water from the Gulf of Mexico!

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

Coriolis Effect… again!

The direction of surface ocean

currents affected by the Coriolis effect!

Ocean Currents