Erosional landforms part 2
- Created by: darcie_cl
- Created on: 26-02-14 20:19
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- Erosional landforms
- ROCK STEPS
- Where weaker rock has been eroded away, leaving differences in the levels of the valley floor
- The glacier flows over less and more resistant rock
- Less resistant rock is eroded down by abrasion and plucking exposing deep troughs / depressions
- Confluence of 2 glaciers = more errosive power
- RIBBON LAKES
- Large narrow lake occupying a U-Shaped valley - stored in depressions
- Once the glacier has melted the meltwater and rainwater collects in the rock-step depressions
- Lake depth depends on compressional and rotational flow --> more abrasion power
- Roche Mutonee
- A rocky hill - smooth rounded up-valley stoss side, downward rigid lee side
- As a glacier meets an obstacle, pressure increases - melting occurs
- Ice melts causing basal sliding
- Abrasion leaves striations as rock debris is dragged along the surface
- On the lee side the ice refreezes pulling large pieces of rock away due too plucking
- ROCK STEPS
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