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WEATHERING AND EROSION

WEATHERING AND EROSION . Haley, Sam, Hailey & Claire. Definitions . Erosion: The gradual distruction or proscess or eroding by nature (wind, water etc ) Weathering: The breakdown and alteration of rocks and minerals at or near earths surface.

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WEATHERING AND EROSION

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  1. WEATHERING AND EROSION Haley, Sam, Hailey & Claire

  2. Definitions • Erosion: The gradual distruction or proscess or eroding by nature (wind, water etc) • Weathering: The breakdown and alteration of rocks and minerals at or near earths surface. • Physical Weathering: Process of breaking down rock by nature; experiencing changes in character • Chemical Weathering: Involving chemical reactions, produces a rock with a new mineral composition

  3. Water Erosion • There are many types of weathering and erosion in nature, but we are focusing on erosion caused by water • The flow of the water is what erodes material • Such as a, flowing river, rain and a running tap • Flowing water causes material like rock to break up and erode away

  4. Water erosion

  5. Why does this happen? • Water in motion is the greatest force in shaping earths surface. • The body of water wears away surface according to velocity and volume • As the water flows past the banks it carries away materials like the rock, dirt and sand. • (physical weathering) • Eventually the moving water weathers down the soil on the banks or rivers and streams

  6. Important factors • Volume of a stream • Corrasion • Flow of water • Transportaion and deposition • Tributary • Mouth of river • Drainage

  7. Types of Water Erosion • Splash erosion: When raindrops fall onto earths surface the impacts can cause detachment of particles • Sheet erosion: Heavy rain fall flows in a sheet along bare soil, removing particles in thin layers • Runoff: extreme amount of water on little surface causing more erosion. • Rill erosion: Heavy rain causes carves in soil, water fills up rills and become gullies • Gully erosion: Flowing water goes along a depression • Valley or Stream erosion: Continuous water flow erodes downward causing valley to become deeper

  8. River Stages • Torrent Course: Fast flowing water erodes rapidly downward or vertically • Valley course: Slower moving water erodes the banks causing lateral erosion • Plain course: Slow winding river over flat ground

  9. Results of water erosion • On the surface which has been eroded by flowing water, it developes a pattern • Drainage patterns or Dendritic Drainage form patterns • Patterns along soil called radical, Dendritic and Trellis.

  10. Form of the earth • Different types of rock erode and weather differently • The flow of water causes slopes, new streams and rivers, deeper valleys, hills and depressions

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