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Understanding Denudation: Earth's Shaping Forces & Weathering Processes

Explore the denudation processes of weathering, erosion, and mass wasting that shape the Earth's land forms. Learn about mechanical, chemical, and biotic weathering processes, as well as the impacts of temperature changes and organic acids on rock formations. Discover how rocks break up and the various chemical processes that lead to their disintegration. Gain insight into unique phenomena like honeycomb weathering and the effects of coastal environments on rock formations.

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Understanding Denudation: Earth's Shaping Forces & Weathering Processes

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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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