Geology

• two types of coastline

  concordant

  discordant
• what is a concordant coastline

  when rocks are parallel to coast
• what is a discordant coastline


  when rocks are at right angles to coastline
• which coastline causes greater recession

  discordant
• landfroms at concordant

  coves, Dalmatian coastlines, Haff coastlines
• why do coves form at concordant

  softer rock behind the hard rock erodes more qiuickly
• landforms at discordant


  headlands and bays

  stacks and stumps

  beaches
• why do beaches form at discordant coastlines


  headlands and bays form low energy coastline
• why dot stacks and stumps form at discordant coastlines

  due to wave refraction the headland erodes more quickly
• what is wave refraction

  the bending of waves as they approach a coastline
• 4 types of rock

  metamorphic

  igneous

  sedimentary

  unconsolidated
• what are the two strong rocks

  metamorphic

  igneous
• why is metamorphic rock strong/resistant

  mixture if rocks formed due to heat and pressure in earths crust
• why is igneous rock strong

  interlocking crystals
• two weaker rocks

  sedimentary

  unconsolidated
• What is a sedimentary rock?

  rock that forms when sediments are compacted and cemented together
• what is unconsolidated rock?

  weak rock
• example of metamorphic rock and its recession rate

  granite

  0.1-0.3 cm per year
• example of sedimentary rock and recession rates


  limestone 1-2 cm per year

  chalk 1-100 cm per year
• example of unconsolidated rock and recession

  boulder clay

  100-1000 cm per year
• how does igneous rock form

  hot molten rock crystallises and solidifies
• what is boulder clay a form of

  glacial till
• how was boulder clay formed due to ice age

  ice sheet expanded carrying debris, rock and sand. when it melted it deposited this sediment to form boulder clay