Physical Landscapes in the UK

• What is mechanical weathering?

  Breakdown of rock without changing its chemical composition.

  EG: Freeze thaw
• What is chemicak weathering?

  The breakdown of rocks through chemical reactions.

  EG: carbonation weathering
• What is freeze thaw weathing?

  1. Water seeps into cracks in rock.
  2. when the water freezes, it expands which puts pressure on the rock
  3. when water thaws, it contracts which releases the presssure
  4. the repeated process of freezing and thawing widens the cracks which causes the rock to fall and break