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Weathering

Weathering. Lesson Aims. ALL – to know what weathering is MOST – to know what mechanical, chemical and biological weathering is SOME – to know different ways that mechanical, chemical and biological weathering occurs. Today’s key terms:. Weathering Mechanical weathering Chemical weathering

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Weathering

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  1. Weathering

  2. Lesson Aims • ALL – to know what weathering is • MOST – to know what mechanical, chemical and biological weathering is • SOME – to know different ways that mechanical, chemical and biological weathering occurs

  3. Today’s key terms: • Weathering • Mechanical weathering • Chemical weathering • Biological weathering • Freeze-thaw weathering • Exfoliation • Solution • Scree • Pores

  4. Watch the slide show • Watch the slide show of images and information to do with weathering. • Take notes in your books • It does not have to be full sentences it can bullet points

  5. Weathering is the break down of rocks in their original place (the rocks do not move they get worn away from where the are)

  6. It is largely caused by elements of the weather such as rainfall and changes in temperature

  7. Mechanical weathering is also known as physical weathering

  8. Mechanical weathering breaks up rocks without any chemical changes. It often results in piles of angular rocks called scree at the base of the rock feature.

  9. Chemical weathering is a chemical reaction between the rock and acidic rainwater

  10. Biological weathering involves the actions of flora and fauna. Plant roots are effective at growing and expanding in cracks in rocks

  11. Mechanical weathering – Freeze Thaw • Wider world page 234 • Take notes on what freeze-thaw weathering is • Then copy this diagram

  12. Mechanical weathering – Exfoliation • Wider world page 234 • Take notes on what exfoliation is

  13. Chemical weathering – Solution • Wider world page 234 • Take notes on what chemical weathering is • Then copy this diagram

  14. Quiz • Weathering is the breakdown of rocks where they are carried away. True or False? • What type of weathering is freeze-thaw? • Name a type of chemical weathering • What type of weathering involves plants breaking down rocks? • What is the name for angular rocks? • What is mechanical weathering also known as? • Chemical weathering is a reaction between the rock and what else? • Chemical weathering reacts strongly with which two rocks?

  15. Answers • False • Mechanical • Solution • Biological • Scree • Physical weathering • Acidic rainwater • Limestone and chalk

  16. Homework • Choose one rock type to research – metamorphic, igneous, sedimentary • Create an A3 poster on your rock type. Include the following: • Position on geological timescale • How it was created linking with the rock cycle • Features of the rock type • Examples of rock • Images / diagrams • Example of a place in the UK with that rock type • How it might be affected by weathering • How that rock type may be used for example in concrete of for building

  17. Lesson Aims • ALL – to know what weathering is • MOST – to know what mechanical, chemical and biological weathering is • SOME – to know different ways that mechanical, chemical and biological weathering occurs

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