Electromagnetic waves cannot travel through empty space.

• True

• False

Earth’s atmosphere is divided into layers based on *

• color

• radiation

• ultra violet

• temperature

Most electromagnetic waves are absorbed before reaching the surface.

• True

• False

Without the ozone layer, too much ____________ radiation would reach Earth's surface.

• UV

• IR

• visible

• microwave

The sky appears blue because gas molecules scatter ____________ wavelengths of visible light.

• shorter (blue)

• longer (red)

What percentage of radiation is absorbed by the Earth's surface?

• 50%

• 25%

• 75%

• 10%

What gases "enhance" the greenhouse effect?

• oxygen

• nitrogen

• methane

• carbon dioxide

What would happen if some heat didn't escape into space?

• no effect

• the Earth would become much colder

• the Earth would become much warmer

The faster the particles move, the __________ energy they have.

• more

• less

• same

• no

How are temperature and thermal energy different?

• they are not different

• temperature is the total energy of motion, thermal energy is the average energy of motion

• temperature is the average energy of motion, thermal energy is the total energy of motion