1. What is heat?
-Heat is energy that flows from an object with a higher temperature to an object with a lower temperature.
High Temperature
Low Temperature
What is the source of Earth’s energy?
The Sun

2. The Sun is important because it:
Provides heat and light
Creates the wind
Creates ocean currents
Provides energy to plants

3. 6% reflected by the atmosphere
25 % reflected from clouds
15% absorbed by the atmosphere
4% reflected from Earth’s surface
50 % directly or indirectly absorbed by Earth’s surface

4. Heat is transferred through the atmosphere through:
Radiation
Conduction
Convection

5. Radiation
-Radiation is heat that is transferred in the form of rays or waves
Example: Microwaves, Sun rays

6. Conduction
-Conduction is the transfer of heat that occurs when molecules bump into one another
-Heat travels through direct contact
-Example: your feet get hot on the beach while walking on the sand

7. Conduction

8. Convection
-Convection is the transfer of heat by the flow of a gas or liquid.
- Circulates heat through convection currents

9. What do you think will happen when I hold this spiral over the candle?
Write it down!

10. Atmospheric Pressure and Altitude
Less air pressure
More air pressure

11. Convection
-When air is warmed, molecules in the air start to move apart
-Air pressure decreases because fewer molecules are in the same place

12. Convection -Warm air rises because there is less air pressure.
- Cold air sinks because there is more air pressure

13. Convection

14. Which heat transfers do you predict are involved in a lava lamp?
Explain!