introduction to periglacial enviroments

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what are periglacial enviroments?

  • seasonal snow and ice cover characterised by intense frost normally associated with permafrost.
  • permafrost is ground that remains on or below freezing for at least 2 years.
  • the uppermost layer of the permafrost often thaws in the summer and freezes in the winter, many processes occur with in this layer called the active layer.
  • these processes create distinctive landforms.

factors that determine the thickness of the active layer

  • air temperature- latitude, continentality, levels of insolation
  • period of snow cover or period of time without snow cover
  • soil type- grainy soil is less dense and so has larger pore spaces, this means more air can get into the ground and melt the active layer more, clay soil is denser

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