1. Do Now
Do work sheet

4. Ways to Transfer Heat

6. Radiation
Energy from the sun reaches our planet in the form of radiant energy or radiation.
*Forms of radiant energy include:
heat, light, X-rays, and radio waves.*

8. The sun gives off different types of radiation.
Radiation is the transfer of energy by electromagnetic waves.
The sun gives off different
types of radiation.
Waves can either:
Get reflected back into space
Get absorbed by the atmosphere
Get absorbed by land and water
more common

9. Conduction
The direct transfer of heat from one substance to another substance is called conduction.
Example:
When the sun’s radiation is absorbed by an object like asphalt and we walk on it, we feel the heat because of conduction.

11. Some solids like metals or glass are good conductors of heat that is why we use them for cooking.

12. Convection Convection is the transfer of heat by the flow of material.
Warm air = molecules far apart; low air pressure; lower density
Cool air = molecules close together; high air pressure; higher density

14. Cooler, denser air sinks while warmer, less dense air rises, forming a convection current.

15. Earth's Water All the water on Earth’s surface is the hydrosphere.
97% salt water – 2% of which is frozen
3% fresh water – 2/3 of which is frozen in the ice caps
1% of the water supply on earth can be used as drinking water

16. The Water Cycle
Review

17. Let's Review!!! radiation reflected radiation conduction convection
The Sun’s __________ is either absorbed or __________ by Earth.
Heat is transferred by __________ (waves), __________ (contact), or __________ (flow).
The __________ affects climate.
Water moves between the hydrosphere and the atmosphere through a continual process of ____________ and _____________.
Earth’s ___________ controls the amount of solar radiation that reaches Earth’s surface.
reflected
radiation
conduction
convection
water cycle
evaporation
condensation
atmosphere

18. Homework