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The Power of Water

The Power of Water. Water has a lot of power (video). Moving Water. Waves and Tides Tsunamis Flowing and Falling Water. Waves and Tides. Waves and tides are just two examples of how water moves on the Earth.

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The Power of Water

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  1. The Power of Water Water has a lot of power (video)

  2. Moving Water • Waves and Tides • Tsunamis • Flowing and Falling Water

  3. Waves and Tides • Waves and tides are just two examples of how water moves on the Earth. • Waves are movements on the surface of water. The water itself doesn't travel - it acts as the medium for the 'wave action' to occur. • Tides are the regular rising and falling of very large bodies of water. • Waves are changes in patterns that move along the water's surface.

  4. Causes of waves • Most waves are caused by the force of wind. Stronger winds larger waves. • The force of waves crashing against a shoreline can cause changes to the shape of the shoreline • Erosion and deposition can reshape the shoreline dramatically.

  5. Tsunamis • When an earthquake occurs on the ocean floor, a huge damaging wave can be created. • These waves are called tsunamis • Demonstration

  6. Damaging Waters • Floods and Avalanches • Floods usually occur after a heavy rainfall • They cause major concerns for people leaving in lowlands • To defend areas at risk engineers build levees • Avalanche is created by the slide of snow • The friction between layers of snow can not hold the gravity • What is the measure of defense from avalanche?

  7. Harvesting Water’s Power

  8. Erosion • Erosion is defined as the removal of soil, sediment, and rock fragments from the landscape. • The word "erosion" comes from an old word meaning "eat away.“ • Running water is by far the most important agent of erosion within our watershed.

  9. Erosion…cont. • Gravity is the force that causes water to run downhill and erode the slopes • Water cascading over Niagara Falls has moved the edge of the falls upstream by 11 km in the last 12 000 years

  10. Sediment • The material carried away by erosion, is deposited in other places, creating sediments. • The sediment includes gravel, sand, silt, and mud into the river • When the speed of the water slows down, the sediments settle on the bottom

  11. Reading • Science & Technology 8 p. 214-215 • Homework: • Using a variety of print and electronic resources, investigate some recent disasters caused by snow or ice. Could human intervention have prevented them from occurring? • Get prepared for discussion in the next science class

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