Energy for Earth

Energy for Earth

Mr.Mendoza

Radiation

transfer of energy through space by EM waves (visible light, ultraviolet radiation, & other waves)

Radiation

The Sun’s energy reaches Earth by the process of radiation. About 50 % of the Sun’s energy is absorbed by Earth’s surface.

Remember:ozone blocks most of the UV radiation.

Multiple Choice

Which one carries the radiation energy

• Air

• Human

• Sunlight

• water

Differential Heating

Which heats up and cools down more slowly – water or land?

Differential Heating

This is called differential heating. This is what moderates the climate in coastal areas.

In winter, the ocean acts like a giant heater and in summer, the ocean acts like a giant air conditioner.

Differential Heating and North Carolina

Conduction

the transfer of energy that occurs when molecules collide

Air molecules just above Earth’s surface are warmed by conduction. Energy moves from your hand to your desk. Why?

Multiple Choice

What type of heat transfer takes place when you touch a warm mug of hot chocolate?

• Radiation

• Convection

• Conduction

• None of the above

Multiple Choice

Land heats up and cools down faster than water.

• True

• False

Multiple Choice

What is the definition of CONDUCTION?

• When heat is transferred from objects like rays of light or electromagnetically.

• a hot liquid or air that expands, becomes less dense, and rises or becomes more dense, and sinks.

• When heat transfers from objects that are touching.

• When heat transfers through the heater or AC in your house.

Convection

the transfer of energy by the flow of a heated substance

Warm air will rise.

When the warm air gets high enough, it cools and sinks.

This creates a convection current.

Multiple Choice

How is heat transferred when boiling a pot of water on the stove?

• conduction

• convection

• combustion

• radiation

Multiple Choice

Which best describes the process of convection?

• Convection is the primary way heat travels through rays.

• Convection is the primary way heat travels through metals.

• Convection is the primary way heat travels through appliances.

• Convection is the primary way heat travels through liquids and gasses.