Mick Harper wrote:However, since the 'rest stop' was built, erosion of the entire landscape has taken place everywhere apart from where all the animals, people etc have created an erosion-proof surface ('wattle-and-daub effect', pp 175-8 of TME) leaving the rest-stop over time to become a hillfort.
While out walking our dogs, we paused while crossing the river Og. At last, it is in full flow. I noticed the water looked very white. Why? Seemples! More rain, more erosion of the soft chalk by deposition.
But, in winter time, with lower temperatures, can the water hold more dissolved CO2 than it can in summer time? Therefore, is there also a greater concentration of Carbonic Acid which will dissolve it as well?
I remember enough O'Level Geography to get that far. But I can't remember enough O'Level Chemistry to apply a basic formula for the solubility of chalk
. http://en.wikipedia.org/wiki/Calcium_ca ... d_solution
Can anyone get more neurons bumping into each other than I can, and work out a rule of thumb for how many Kg of chalk will get eroded per year? With basic assumptions for volume of rainfall etc.