Chapter 22 Section 2 Review
1. Explain how radiant
energy reaches Earth.
• Radiation from the sun travels
through space in the form of
2. List and describe the
types of electromagnetic
• Long wavelength: TV/radio waves,
microwave, infrared, and visible light
• Short wavelength: UV rays, X rays,
3. Describe how gases and
particles in the
atmosphere interact with
• Nitrogen, oxygen, and ozone in the upper
atmosphere absorbs most short
• CO2 and water vapor absorb infrared
radiation in the lower atmosphere.
• About 50% of visible light reaches
Earth’s surface. Clouds, particulates and
gases scatter and reflect much of the light.
Formation of OZONE
4. Describe how visible
light and infrared energy
• Infrared and visible light that reach
Earth’s surface are absorbed. Heated
surfaces radiate heat back into the
air where greenhouse gases absorb
some of the heat.
5. Explain how variations
in intensity of sunlight
can cause temperature
differences on Earth’s
• Concentrated sunlight at the equator
makes the surface hotter and at
higher latitudes where sunlight is
spread over a larger area the surface
6. Summarize the processes
of conduction and
• Conduction: transfer of heat energy
by direct contact
• Convection: transfer of heat
energy by movement of a heated
Conduction and convection
7. Why do scientists study
all wavelengths of the
• Earth is affected by all wavelengths
of radiation in the spectrum.
8. Explain how fans in
convection ovens help
cook food more evenly.
• Fans mix the air so hot or cold spots
are less likely to happen in the oven.
9. You decide not to be
outside during the
hottest hours of a
summer day. When will
the hottest hours
probably be? How do
• The hottest hours will probably be in the
late afternoon when Earth’s surface has
had time to absorb and reradiate energy.
This is also when convection reaches its
• The End???
“You should have seen the one that got away”
10. Use the following terms to
create a concept map.
ultraviolet waves, visible
light, scattering, and
Infrared Waves Ultraviolet Waves Visible Light