Chapter 21 Section 2 Review Page 530 by hcj

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									Chapter 21 Section 2
 Review Page 530
Wave parts
   1. Explain how wavelength
   and wave period can be
   used to calculate wave
   speed.
• Wave speed = wavelength
              wave period
  2. Describe the formation of
   waves.


• Uneven heating of Earth creates
 winds. Waves form when friction
 between moving air and water
 causes ripples.
 3. List three factors that
   determine the size of a
   wave.

• Length of time the wind blows in one
  direction
• The speed of the wind
• The fetch (distance the wind can
  blow across open water)
   4. Explain why incoming
   waves refract (bend)
   toward the beach until they
   strike the shore head-on.
• Most waves approach the coast at an
 angle. Friction with the bottom
 slows the part of the wave that is in
 the shallower water, while the part in
 the deep water keeps moving fast.
 This causes the wave to bend
 gradually toward the shoreline.
Wave “Bottoms out”
Waves bending as
they approach the shore
    5. Describe what factors
    cause tsunamis.

• Tsunamis are caused by:
• underwater earthquakes
• Volcanic eruptions
• Underwater landslides
6. Explain why waves slow
   down in shallow water.


• Contact with the ocean floor creates
 friction, which causes the wave to
 slow down.
7. Explain how whitecaps
   could affect climate.

• Whitecaps reflect solar energy, which
 allows less radiation to reach the
 ocean. If less thermal (heat) energy
 is transferred to the water, then
 there is less heat available in the
 water to moderate climates along the
 path of ocean currents.
The End

								
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