Exam Questions

• Explain the concept of negative feedback within the carbon cycle?

  • Negative feedback Is where a System counteracts a change to restore dynamic equilibrium
  • e.g increased co2 levels = increased temps
  • this also means increased level of co2 uptake Of plants - meaning can photosynthesise more
  • meaning more CCS can take place within these plants and a state of dynamic equilibrium can be restored
• Example of positive feedback in the water cycle?

  • Temperature rises globally -> ocean temp increases -> dissolved co2 trapped in ice released (increased evap)-> more green house gases in atmosphere -> atmospheric temp rises
• Outline the process of sub-aerial weathering in the development of coastal landscapes

  • Sub-aerial weathering involves the action of rainwater upon the coastal landscape, materials are broken down in-situ, e.g. biological and freeze-thaw weathering, roots growing into cracks - making cracks bigger, water freezes in cracks then breaks - making cracks bigger
  • This leads to processes such as sliding and slumping - mass movements