Earth Science Unit 5.5 Ocean Waves and Tides

Essential Questions:
What are waves?
What are the properties of ocean Waves?
What powers ocean waves?
What happens when waves reach the shore?
What are tides?
What’s the moon got to do got to with it?

What are waves?

sample board problems wavelength, period, frequency, amplitude
Sound’s speed in seawater is of particular interest to anyone trying to use sonar or other underwater exploration techniques. The speed of sound in sea water is, on average, about 1560 m/s, or 3490 mph. But ocean waves are much slower:

Wave velocity is the speed of the wave. Velocities of normal ocean waves are about 90 km/hr while tsunami have velocities up to 950 km/hr (about as fast as jet airplanes), and thus move much more rapidly across ocean basins.

(videos #4 and #5)