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Do Now 11/23/09

Do Now 11/23/09. 1. What are the 3 most abundant dissolved gases in the ocean? Out of these three which is the most abundant? 2 . What effects surface currents, yet does not affect density currents? 3 . What would happen if density currents stopped flowing? How could they stop flowing?.

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Do Now 11/23/09

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  1. Do Now 11/23/09 1. What are the 3 most abundant dissolved gases in the ocean? Out of these three which is the most abundant? 2. What effects surface currents, yet does not affect density currents? 3. What would happen if density currents stopped flowing? How could they stop flowing?

  2. Chp.7-3 Waves

  3. What are waves and what causes them? • Wave: A rhythmic movement that carries energy through the water. • Waves are cause by wind. • 3 Factors that affect wave height: • Speed of the wind. • Length of time the wind blows. • Distance over which the wind blows. • A fast wind that blows over a long distance for a long time creates a huge wave. • Example: Tsunami

  4. What are the parts of a wave? • Crest: A waves highest point. • Trough: A waves lowest point. • Wave height: Vertical distance between the crest and trough. • Wave Length: The horizontal distance between the crest and trough of two successive waves. • Normal wave height in the open ocean is 2-5 meters. Waves can reach up to 30 meters during storms. • Example- “The Perfect Storm”

  5. How do waves move? • When you are on the beach; in which direction do the waves look like they are moving? • Unless the wave is breaking onshore, the water does not move forward. • Example: Fishing bobber • Breakers: • Occurs when an ocean wave creates friction with the ocean bottom. • The bottom of the wave slows, the crest and trough come closer together and the wave height increases. • Breakers can create beaches and move them through erosion.

  6. What are tides? • Tide: The rise and fall of sea level. • High Tide: When sea level rises. • Low Tide: When sea level falls. • The difference between high and low tide is called tidal range. • Causes of tides: • Created by gravitational pull of the Earth, Moon, and Sun. • The moon pulls hard on Earths water particles creating two bulges of water. • These bulges follow the moon in its travels. • The crest of the bulges are high tides.

  7. Tides • Spring Tides occur when the Sun, Moon, and Earth are aligned. • High tides are higher and low tides are lower. • Neap Tides occur when the Sun, Moon, and Earth form a right angle. • High tides are lower and low tides are higher.

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