The figure below shows a limestone cliff which is undergoing weathering. Answer

Question

The figure below shows a limestone cliff which is undergoing weathering. Answer the following questions about it: 3. Describe one process that might be responsible for producing the "Scree" sediments at the bottom of the cliff. The scree sediments are known to be large, angular, and have many different particle sizes mixed together. Describe how you think the following characteristics of the scree material will change if the sediments are transported downstream by the river a. b. i. Particle size ii. Particle shape ii Location of particles with different sizes Gorge 1B Sedment of large, angular poorly-sorted fragments Limestone Scree River

Explanation / Answer

a. Scree sediments are formed by the process of freeze thaw weathering. It mainly depends on climate and temperature variations. Water seeps into the crack of the rocks. It gets expanded when water freezes and it gets contracted when water melts. Since water expands about 9% during freezing cycle, it will exert large forces that will further create cracks in rock.This will gradually split the rock. Continuous freeze thaw cycle will form small debris and these loose particles will be removed by gravity forces or under the effect of wind or water. This will get deposited at the bottom of cliff.

b. The transportation of particles by river can affect the characteristics in the following way :

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