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Denudation

Denudation. Lesson Plan. What is denudation?. The shaping of the earth. What shapes the land?. Denudation processes. Weathering erosion mass wasting/ mass movement. W hat are they?. What is weathering ?. Processes leading to disintegration and decomposition of rock.

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Denudation

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  1. Denudation Lesson Plan

  2. What is denudation? • The shaping of the earth

  3. What shapes the land?

  4. Denudation processes • Weathering • erosion • mass wasting/ mass movement What are they?

  5. What is weathering? Processes leading to disintegration and decomposition of rock insitu processes

  6. How does the rock break up? • 1. Mechanical weathering/ Physical weathering • 2. Chemical weathering • 3. Biotic / Biological weathering

  7. Mechanical weathering • Caused by • temperature changes • unloading brought about by denudation • salt crystal growth

  8. Block Disintegration With repeated expansion and contraction, the rock breaks up along joints

  9. A Disintegrated block

  10. Exfoliation

  11. Rock peels off

  12. Granular disintegration

  13. Chemical weathering • Decomposition of rock caused by rain, air (e.g. Carbon dioxide) and organic acids. • Active in hot and wet areas

  14. What Chemical Processes? • Solution • Hydration • Hydrolysis • Oxidation • Carbonation How do they act on rock?

  15. Honeycomb weathering

  16. They are always found near the coast. Why?

  17. Spheroidal weathering Partially weathered core-stone Totally weathered outer layer

  18. Biotic/ Biological Weathering • Physical break up of rock by plant roots or burrowing animals • Chemical decay of rock facilitated by organic acid produced by plants and animals

  19. Weathered granite in HK

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