Warm-up  Write today’s date and write the following information in your notebook/binder…  The Unit Objective listed on the small whiteboard  The essential questions on the main board

Videos  Bill Nye Heat Bill Nye Heat Bill Nye Heat  Mr. Parr Heat Transfer song Mr. Parr Heat Transfer song Mr. Parr Heat Transfer song  Discovery Ed heat transfer Discovery Ed heat transfer Discovery Ed heat transfer  Discovery ED. Magic School Bus:Where does the heat go? Discovery ED. Magic School Bus:Where does the heat go? Discovery ED. Magic School Bus:Where does the heat go?

Warm-up  In your own words define convection and give an example of it.  Include an illustration.

Temperature Probe lab Draw this chart in your notebook/binder Student NameMaximum Temperature °F or °C Team Average°F or °C

Warm-up  How does convection relate to the continental drift theory?

Warm-up  Finish heat transfer handout from yesterday. If you are finished study guided notes.

Warm-up  Which best describes why metals are used for making pots and pans that are used for cooking?  a. Metals conduct heat and have a high melting point.  b. Metals conduct heat and have a low melting point.  c. Metals radiate heat and have a high melting point.  d. Metals radiate heat and have a low melting point.

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

Essential Questions  How does heat travel?  What are the effects of heat transfer?  What are the similarities between convection, radiation, and conduction?

Heat Transfer- A connection to the Drifting Continents Did Pangea Exist?

The Theory of Continental Drift  A German scientist named Alfred Wegner formed the hypothesis that the continents had moved!  He proposed that all the continents had once been joined together in a single landmass and have since drifted apart.

The Theory of Continental Drift  Wegner’s idea that the continents slowly moved over the earth became known as continental drift.  Unfortunately Wegener could not provide a satisfactory explanation for the force that pushed or pull the continents. Therefore most geologists rejected his idea.

Evidence of Continental Drift  Evidence from landforms:  Mountain ranges and other features on the continents provided evidence for continental drift.  Mountain ranges in South Africa line up with mountain ranges in Argentina.

Evidence for Continental Drift  Evidence from fossils  A fossil is any trace of an ancient organism that has been preserved in rock.  Glossopteris fossils have been found in rocks in Africa, South America, Australia, India, and Antarctica.

Evidence for Continental Drift  Evidence from climate  Fossils of tropical plants have been found too far south to have survived.  Glacier deposits are found too far north to have existed.  These clues provide evidence that continental drift really happened.

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 Mantle  Energy is constantly on the move!  The movement of energy from warmer object to a cooler object is called a heat transfer  There are three types of heat transfer: radiation, conduction, and convection.

Radiation  Radiation is the transfer of energy through empty space.  Heat transfer by radiation takes place with no direct contact between a heat source and an object.

Conduction  Heat transfer by direct contact of particles is called conduction.  When your hands touches a metal spoon sitting in a boiling pot of soup, the heat from the bottom of the pot is transferred to your hand by conduction.

Conduction

Convection  Convection is the transfer of heat by the movement of a heated fluid.  Convection deals with density.  Density is the measure of how much mass is there in a volume of a substance.

Convection  When a liquid or gas is heated, the particles move faster and the density decreases.  As the fluid becomes cooler, its density increases.  As density increases, the fluid sinks.  Heat Rises!!

Convection  The heating and cooling of the fluid, changes in the fluid’s density, and the force of gravity combine to set convection currents in motion.  Without heat, convection currents will eventually come to a stop.

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

Radiation, Conduction, and Convection