Section 1Pages 42-45

1-Electromagnetic wavesForm of energy that can travel through space (ex: from the sun)

Classified by wavelengthType of energy transfer Radiation

2- RadiationDirect transfer of energy by

electromagnetic waves

3- Most of the energy from the sun reaches the Earth in the form of visible light and infrared radiation, and a small amount of ultraviolet radiation.

4- Infrared RadiationForm of energy with wavelengths that are longer than red light.

Not visible but can be felt as heat.

5- Ultraviolet RadiationForm of radiation that has

wavelengths that are shorter than violet light.

Not visible but causes sunburn, skin cancer and eye damage.

6- What happens to the sun’s energy when it reaches the Earth’s atmosphere?

It is either absorbed or reflected

7- What absorbs the sun’s energy?

Water vapor & carbon dioxide absorb infrared radiation

Ozone Layer absorbs most of the ultraviolet radiation

Clouds, dust and gases also absorb some of the sun’s energy

8- What reflects the sun’s energy?

CloudsDust Gases

9- Define scattering.Reflection of light in all directions

Why is the sky blue?When the white light (from the sun)

hits the gas molecules, the light is scattered in mostly shorter wavelengths (blue and violet), which is what we see.

https://www.youtube.com/watch?v=u4hw-aXiQmc

https://www.youtube.com/watch?v=oG-ibVdYmtI

10- “Energy in the Atmosphere”

11- Explain what happens to the energy that reaches the Earth’s surface.

Energy is absorbed by Earth’s surfaces (at different rates)

The energy is turned into heatIt is radiated back into the

atmosphere as infrared energy (heat)The energy gets absorbed and held

by greenhouse gases (water vapor & carbon dioxide)

12- Greenhouse effect

The process by which gases hold heat in the air.

Two main greenhouse gases are water vapor and carbon dioxide.

How is the greenhouse effect related to global warming?

The amount of CO2 is increasing (more gases that hold heat well) causing the temperature of Earth’s atmosphere to also rise.