Unit 3.2: Weathering & Landscapes

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Presentation transcript:

Unit 3.2: Weathering & Landscapes L/O: To explain the different types of weathering and explain how it occurs What is the difference between weathering and erosion?

What is weathering? Weathering is the break-up and decomposition of rocks in-situ (in their place of origin). Weathering does not involve the movement of material and this makes it different to erosion. Erosion is the carrying away of material by a natural force e.g water, wind, glaciers

SPLAT Granular disintegration Thermal expansion Oxidation Freeze thaw weathering Gravity Carbonation http://www.bbc.co.uk/schools/gcsebitesize/geography/rock_landscapes/processes_rev1.shtml

Tasks: Complete task 1 on page 68 of the sheet you have been given. Read source B and add an example of biological weathering to your diagram / draw your own 3) NOW . . . . Use your own text book to add detail and key terms to your diagram / books Scree Crystalline rocks Diurnal temperature Carbonic acid Reduction 4) How could you carry out an experiment to simulate weathering? http://www.youtube.com/watch?v=emnQJftCZrA

How does Geology (rock types) affect weathering? Super Strong! CHEMICALLY RESISTANT Crystalline Sedimentary Limestone Sandstone Basalt Quartz Granite G R A N I T E Rock Strength o meter! Then: Complete task 3 p117 Rock types

Different types of weathering Chemical Weathering: The break down of rocks caused by a change in their chemical make-up. Physical or Mechanical Weathering: The break down of rocks caused by physical processes with no change in the rocks chemical make up. Biological Weathering: Biological is sometimes included within physical weathering. Biological weathering is when flora and fauna break down the rock e.g. growing roots systems or burrowing animals. HOW CAN CLIMATE AFFECT THIS? http://www.youtube.com/watch?v=1tRan4DVbnQ#t=43 http://www.youtube.com/watch?v=2311yO5opVk

How can climate affect weathering? FROST? TEMERATE? DESERT? HUMID? Task: Find/draw a picture/diagram and then use it to explain each factor Climate: Climate is very important because hot temperatures increase the rates of chemical reaction, therefore increasing chemical weathering. Areas with high diurnal temperature ranges will see an increase in some physical weathering. Wet areas are going to see an increase in chemical weathering. Wet and warm areas are also likely to see an increase in the amount of vegetation, increasing biological weathering.