Chalk and clay

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Chalk and clay

  1. 1. Both sedimentary rocks Formed under the sea and uplifted by tectonic activity Chalk – in south and east UK, looks like bands as it forms layers that cover large areas Clay – common rock found everywah
  2. 2. Chalk Clay Physically tough, but not like granite Weak Heavily jointed and porous Tiny pores which become waterlogged. Permeable, lack of rivers and lack of erosion Impermeable Pure limestone CaCO3 Vulnerable to carbonation, freeze- thaw. Forms excarpment – dip slope, scarp slope, dry valley... E.g. White cliffs of Dover, South Downs Forms low flat ground called vales.

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