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Ocean Waves and Tides Waves A Wave is a rhythmic movement that carries energy through matter or space. A Wave is a rhythmic movement that carries energy.

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Presentation on theme: "Ocean Waves and Tides Waves A Wave is a rhythmic movement that carries energy through matter or space. A Wave is a rhythmic movement that carries energy."— Presentation transcript:

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2 Ocean Waves and Tides

3 Waves A Wave is a rhythmic movement that carries energy through matter or space. A Wave is a rhythmic movement that carries energy through matter or space. In oceans, waves move through seawater In oceans, waves move through seawater

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5 Waves Caused by: Wind Wind Earthquakes Earthquakes Gravitational force of the Moon and Sun. Gravitational force of the Moon and Sun.

6 Parts of a Wave Crest – highest point of a wave Crest – highest point of a wave Trough – lowest point of a wave Trough – lowest point of a wave Wave Height – vertical distance between the crest and the trough Wave Height – vertical distance between the crest and the trough Wavelength – horizontal distance between two crests or two troughs Wavelength – horizontal distance between two crests or two troughs

7 Wavelength Wave Height Crest Trough Still Water Wave Parts

8 Wave Movement When a wave passes through the ocean, individual water molecules move up and down but they do not move forward or backward. When a wave passes through the ocean, individual water molecules move up and down but they do not move forward or backward.

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10 Wave Movement When a wave breaks against the shore, the crest outruns the trough and the crest collapses. When a wave breaks against the shore, the crest outruns the trough and the crest collapses. Called a breaker. Called a breaker. In this case, water does move forward and backward. In this case, water does move forward and backward.

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12 Waves Caused by Wind When wind blows across a body of water, friction causes the water to move along with the wind. When wind blows across a body of water, friction causes the water to move along with the wind. Wave Height depends on – Wave Height depends on – –Wind speed –Distance over which the wind blows –Length of time the wind blows

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16 Tides The rise and fall in sea level is called a tide. The rise and fall in sea level is called a tide. Caused by a giant wave. Caused by a giant wave. One low-tide/high-tide cycle takes about 12 hrs and 25 min. One low-tide/high-tide cycle takes about 12 hrs and 25 min. Tidal range is the difference in ocean level between high-tide and low-tide Tidal range is the difference in ocean level between high-tide and low-tide

17 What is the Tidal Range? HT = 30 ft, LT = 20 ft HT = 30 ft, LT = 20 ft HT = 20 ft, LT = 12 ft HT = 20 ft, LT = 12 ft HT = 50 ft, LT = 20 ft HT = 50 ft, LT = 20 ft

18 Gravitational Effect of the Moon Two big bulges of water form on the Earth: Two big bulges of water form on the Earth: –one directly under the moon –another on the exact opposite side As the Earth spins, the bulges follow the moon. As the Earth spins, the bulges follow the moon.

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20 Gravitational Effect of the Sun Spring Tides Spring Tides –Earth, Moon, and Sun are lined up –High Tides are higher and Low Tides are lower than normal

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22 Gravitational Effect of the Sun Neap Tides Neap Tides –Earth, Moon, and Sun form right angles –High Tides are lower and Low Tides are higher than normal

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24 The End


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