1. Why is it difficult to determine Earth’s interior structure?

2. What causes seismic waves?3. How are seismic waves used to

provide evidence about Earth’s interior?

4. How do temperature and pressure change as you go deeper into Earth?

5. What is the difference between the outer core and the inner core?

Study for quiz on Friday.

Convection and the MantleChapter 3:2

S6E5e Recognize that lithospheric plates consistently move and cause major geological events on the Earth’s surface.

Words to Know NBV Convection Conduction Radiation Density Convection Current

1. How does heat from the sun travel to Earth?

2. How does heat from a cup of hot chocolate make the spoon hot?

3. How does heat from a stove top make the entire pan of soup hot?

What do you know? NB46

Heat Energy Travels 3 Ways:Radiation, Conduction, & Convection Radiation: heat is

transferred through empty space.

There is no direct contact between the heat source and an object.

Example: Sunlight warming the earth’s surface.

Can you think of other examples?

NB 47 Draw and label a picture that reminds you of heat transfer by radiation.

Heat Energy Travels 3 Ways:Radiation, Conduction, & Convection

Conduction: When heat is transferred by direct contact.

The heat is transferred when you touch it!

Example: you touch a hot pan and get burned

Can you think of other examples?

NB 47 Draw and label a picture that reminds you of heat transfer by conduction.

Heat Energy Travels 3 Ways:Radiation, Conduction, & Convection

Convection: the transfer of heat by the movement of a heated fluid or gas

As the fluid or gas heats, the molecules spread out and become less dense. Then they move upwards, over the cooler fluid. Then as it cools, it becomes more dense and sinks.

Example: heating a pot of soup

Can you think of other examples?

NB 47 Draw and label a picture that reminds you of convection.

http://www.teachersdomain.org/resource/lsps07.sci.phys.energy.heattransfer/

Overview of the 3 methods of Heat Transfer

When something is heated, does it become more dense or less dense?

Record your hypothesis:If the air in a balloon is heatedThen the air will become (more or less) dense.

Record your observations. Conclusion: Do the results support your

hypothesis? Yes or No Summarize what you learned in one

sentence.

Teacher Demo/ ConvectionExperiment NB47 (Safety Goggles? Why?)

http://education.sdsc.edu/optiputer/flash/convection.htm

These currents are the forces that drive plate tectonics.

Act it out (quietly): The floor is the hot outer core of the Earth. You are hot rock in the mantle. Hot rock rises because it is less dense, then it cools and becomes more dense, and then it sinks.

Watch Convection

Convection Current The cycle of heating, cooling, and sinking repeats over and

over and over and over and over and over. This causes convection currents. The heat from the core

causes convection currents in the mantle. Isn’t that neat!!!

http://safarivideo/SAFARI/montage/play.php?keyindex=1660

While listening answer questions on the video quiz. Use your own paper. NB 46

Self-check

What does Bill Nye say about heat transfer?

Record your hypothesis. If…, Then… Record your observations. Conclusion: Do the results support your hypothesis? Yes or

No How did the heat move from the candle to the paperclips? Summarize what you learned in one sentence.

Teacher Demo/ ConvectionExperiment NB49 (Safety Goggles? Why?)Paper Clip Start Time Drop Time Total Time

#1#2#3#4#5#6

1. What are the three types of heat transfer? 2. What causes convection currents in the

mantle?3. Draw and label a convection current. Use

arrows to show the direction the material is moving.

4. Describe in your own words how convection currents form, use the terms less dense and more dense in your description.

5. What causes convection currents in the mantle?

Show what you know. NB48