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Water and Weather. Chapter Seven: Oceans. 7.1 Introduction to Oceans 7.2 Waves 7.3 Shallow Marine Environments 7.4 The Ocean Floor. Investigation 7B. Wave Speed. What is the relationship between water depth and wave speed?. 7.2 Waves.
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Chapter Seven: Oceans • 7.1 Introduction to Oceans • 7.2 Waves • 7.3 Shallow Marine Environments • 7.4 The Ocean Floor
Investigation 7B Wave Speed • What is the relationship between water depth and wave speed?
7.2 Waves • Waves are caused by a disturbance moving forward. • In the case of water waves, the water moves up and down as the disturbance moves forward.
7.2 Making waves • Waves occur as a repeating pattern of crests and troughs.
7.2 Making waves • The amplitudeof a wave is the distance between a wave crest or trough and the average level of motion. • Wavelengthis the length of one complete wave.
7.2 More about waves • A wave causes a circular motion in the water as it passes by. • Water waves have predictable behaviors.
7.2 More about waves • The seagull and the dolphin experience the same wave, but the dolphin’s circular path (below the surface) is smaller than the seagull’s. • They may be no wave motion below the dolphin.
7.2 Wind causes waves • Most ocean waves are caused by friction between the wind and the ocean surface. • Fetchis the amount of open water over which wind blows.
7.2 What happens when waves meet • When waves formed in different places come together, the waves add to and subtract from each other.
7.2 Tsunamis compared to wind waves • A tsunamiis a huge wave made by a large disturbance like an underwater earthquake, landslide, or volcanic eruption.