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TIME AND SPACE (LARGER SCALES (Past processes are still able to dominate,…
TIME AND SPACE
LARGER SCALES
Past processes are still able to dominate
10 to 4 yrs and >10 to 4 m
Short - term observations are misleading
Too few examples to derive any gerneral rules
10 to 1 - 10 to 4 yrs and 10 to 1 - 10 to 4 m
CONVENTIONAL TIME AND SPATIAL SCALES
Many examples from which to derive normative rules
Climate change and tectonic effects are relatively weak
Landform size and shape, rate of sediment transport etc. may be predicted with confidence using observed processes
SMALLER SCALES
At <10 to -7 years and < 1 m. (possibly between weeks and days)
Process models don't seem to work
Time dependant and seemingly intermittent activity that is currently poorly understood
LARGER SCALE FEEDBACKS
FEEDBACK BETWEEN TOPOGRAPHY AND CLIMATE
High mountains become glaciated
Glacial erosion speeds up the wearing down of mountain ranges
FEEDBACK BETWEEN CLIMATE AND TOPOGRAPHY
Erosion controlled isostatic uplift
Peter Molnar and Phillip England, 1990
Chicken or egg
Cenozoic uplift been credited for most current mountain ranges.
belief that is a consequence of climate change that causing the uplift changes seen
also tectonic involvement = Eurasian and indian plate collided in the Cenozoic era and created himalayas which are still present
Gives appearance of tectonic uplift when there hasnt been any