Warm-upWarm-up

Write today’s date and write the Write today’s date and write the following information in your following information in your notebook/binder…notebook/binder…

The Unit Objective listed on the The Unit Objective listed on the small whiteboardsmall whiteboard

The essential questions on the The essential questions on the main boardmain board

VideosVideos

Bill Nye HeatBill Nye HeatMr. Parr Heat Transfer songMr. Parr Heat Transfer songDiscovery Ed heat transferDiscovery Ed heat transferDiscovery ED. Magic School Discovery ED. Magic School

Bus:Where does the heat Bus:Where does the heat go? go?

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In your own words define In your own words define convection and give an convection and give an example of it.example of it.

Include an illustration.Include an illustration.

Temperature Probe labTemperature Probe labDraw this chart in your notebook/binderDraw this chart in your notebook/binder

Student Name Maximum Temperature

°F or °C

°F or °C

°F or °C

°F or °C

Team Average °F or °C

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How does convection How does convection relate to the relate to the continental drift continental drift theory?theory?

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Finish heat transfer Finish heat transfer handout from yesterday. handout from yesterday. If you are finished study If you are finished study guided notes.guided notes.

Warm-upWarm-up Which best describes why metals are used Which best describes why metals are used

for making pots and pans that are used for for making pots and pans that are used for cooking?cooking?

a. Metals conduct heat and have a high melting a. Metals conduct heat and have a high melting point.point.

b. Metals conduct heat and have a low melting b. Metals conduct heat and have a low melting point.point.

c. Metals radiate heat and have a high melting c. Metals radiate heat and have a high melting point.point.

d. Metals radiate heat and have a low melting d. Metals radiate heat and have a low melting point.point.

Unit ObjectivUnit Objectivee

You will learn how conduction, You will learn how conduction, radiation and convection are radiation and convection are methods of heat transfer, and methods of heat transfer, and that heat energy will travel in that heat energy will travel in the direction of warmer to the direction of warmer to cooler temperatures.cooler temperatures.

Essential QuestionsEssential Questions

How does heat travel?How does heat travel?What are the effects of heat What are the effects of heat

transfer?transfer?What are the similarities What are the similarities

between convection, between convection, radiation, and conduction?radiation, and conduction?

Heat Transfer- A Heat Transfer- A connection to the connection to the

Drifting ContinentsDrifting Continents

Did Pangea Exist?Did Pangea Exist?

The Theory of Continental DriThe Theory of Continental Driftft A German scientist A German scientist

named Alfred Wegner named Alfred Wegner formed the hypothesis formed the hypothesis that the continents had that the continents had moved!moved!

He proposed that all the He proposed that all the continents had once been continents had once been joined together in a single joined together in a single landmass and have since landmass and have since drifted apart.drifted apart.

The Theory of Continental The Theory of Continental DriftDrift

Wegner’s idea that the Wegner’s idea that the continents slowly continents slowly moved over the earth moved over the earth became known as became known as continental drift.continental drift.

Unfortunately Wegener Unfortunately Wegener could not provide a could not provide a satisfactory explanation satisfactory explanation for the force that for the force that pushed or pull the pushed or pull the continents. Therefore continents. Therefore most geologists most geologists rejected his idea.rejected his idea.

Evidence of Continental DriftEvidence of Continental Drift Evidence from Evidence from

landforms:landforms: Mountain ranges and Mountain ranges and

other features on the other features on the continents provided continents provided evidence for evidence for continental drift.continental drift.

Mountain ranges in Mountain ranges in South Africa line up South Africa line up with mountain ranges with mountain ranges in Argentina.in Argentina.

Evidence for Continental DriftEvidence for Continental Drift Evidence from fossilsEvidence from fossils A fossil is any trace A fossil is any trace

of an ancient of an ancient organism that has organism that has been preserved in been preserved in rock.rock.

Glossopteris fossils Glossopteris fossils have been found in have been found in rocks in Africa, South rocks in Africa, South America, Australia, America, Australia, India, and Antarctica.India, and Antarctica.

Evidence for Continental DriftEvidence for Continental Drift Evidence from climateEvidence from climate Fossils of tropical Fossils of tropical

plants have been found plants have been found too far south to have too far south to have survived.survived.

Glacier deposits are Glacier deposits are found too far north to found too far north to have existed.have existed.

These clues provide These clues provide evidence that evidence that continental drift really continental drift really happened.happened.

Rejection!!Rejection!!

Even with the evidence, most scientists rejected Alfred Wegner’s theory for about a half a century, from the 1920s to the 1960s.

Convection Currents in the MantleConvection Currents in the Mantle Energy is constantly Energy is constantly

on the move!on the move! The movement of The movement of

energy from warmer energy from warmer object to a cooler object to a cooler object is called a object is called a heat transferheat transfer

There are three types There are three types of heat transfer: of heat transfer: radiation, radiation, conduction, and conduction, and convection.convection.

RadiationRadiation Radiation is the Radiation is the

transfer of energy transfer of energy through empty through empty space.space.

Heat transfer by Heat transfer by radiation takes radiation takes place with no direct place with no direct contact between a contact between a heat source and an heat source and an object.object.

ConductionConduction Heat transfer by direct Heat transfer by direct

contact of particles is contact of particles is called conduction.called conduction.

When your hands When your hands touches a metal spoon touches a metal spoon sitting in a boiling pot sitting in a boiling pot of soup, the heat from of soup, the heat from the bottom of the pot the bottom of the pot is transferred to your is transferred to your hand by conduction.hand by conduction.

ConductionConduction

ConvectionConvection Convection is the Convection is the

transfer of heat by transfer of heat by the movement of a the movement of a heated fluid.heated fluid.

Convection deals Convection deals with density.with density.

Density is the Density is the measure of how measure of how much mass is there much mass is there in a volume of a in a volume of a substance.substance.

ConvectionConvection When a liquid or gas When a liquid or gas

is heated, the is heated, the particles move faster particles move faster and the density and the density decreases.decreases.

As the fluid becomes As the fluid becomes cooler, its density cooler, its density increases.increases.

As density increases, As density increases, the fluid sinks.the fluid sinks.

Heat Rises!!Heat Rises!!

ConvectionConvection The heating and cooling The heating and cooling

of the fluid, changes in of the fluid, changes in the fluid’s density, and the fluid’s density, and the force of gravity the force of gravity combine to set combine to set convection currents in convection currents in motion.motion.

Without heat, convection Without heat, convection currents will eventually currents will eventually come to a stop.come to a stop.

Convection in the Earth’s MantleConvection in the Earth’s Mantle

The heat The heat source for source for these these convection convection currents in the currents in the mantle comes mantle comes from the heat from the heat of the Earth’s of the Earth’s core.core.

Radiation, Conduction, and Radiation, Conduction, and ConvectionConvection