1. Waves
Chapter 14, Section 3
Bell Ringer: “You are floating on a raft in the ocean 1 km from shore, which is north of you…
A surface current is flowing east. Are you more likely to travel north with the waves Toward the shore or east with the surface current?”

2. Objectives: Explain causes of waves, currents, and tides
What are the parts of a wave
Explain how a wave is different from currents & tides)
brainpop ocean currents

3. Tech Terms: Wave Anatomy
Wave: Movement of energy through a body of water. Wind transfers its energy to the water.
Crest: The highest point of a wave.
Trough: The lowest point of a wave.
Wavelength: the horizontal distance between 2 neighboring crests or 2 troughs.
Wave height: (amplitude) the vertical distance between the crest and the trough.

4. Wave Anatomy: Draw and Label!
waves? = energy

5. Waves & Wind
form when wind blows across the water’s surface and transmits its energy to the water.
size of the wave depends on strength of the wind and how long it blows.
Near the shore, the wave height increases and the wavelength decreases.
United streaming

6. Wave Formation and Movement If you have watched ocean waves before, you may have noticed that water appears to move across the ocean’s surface. However, this movement is only an illusion. Most waves form as wind blows across the water’s surface and transfers energy to the water. As the energy moves through the water, so do the waves. But the water itself stays behind, rising and falling in circular movements. Notice in Figure 2 that the floating bottle remains in the same spot as the waves travel from left to right.  eactivity

9. Wave
Website for image and wave explanation (double click links to open in your browser)

10. Types of Waves:
As a deep-water wave begins to interact with the shore, (becomes a shallow-water wave) it also slows down & builds up and increases the wave height.
A Breaker occurs when gravity pulls high waves down (crest) and crashes into the ocean floor.

11. Types of waves eactivity

12. How do waves change the shore line?
Longshore currents-when waves hit shore at an angle, causing water to move along shore in a current.
These currents tear down and build up the coastline because they hit the shore sediment.

13. Storm Surge: Storm surges are caused by strong storms (____________) and involve a rise in __________ in a concentrated area.

14. Tsunami
Waves that form from sudden movement of ocean water: earthquakes, volcanic eruptions, landslides, and meteorite/comet impact

15. In Summary: Ocean Motions in the Real World

16. Crazy Currents!
What do currents, wind, climate, and oceans have in common? Let’s Investigate  “Read it, See it, Do it!”

17. What to do when you are finished with your conclusion questions?