weathering

• chemical weathering: rocks mineral composition changed
• weathering: impact on the land
• mechanical weathering examples:

  freeze thaw - water in cracks expands as it is frozen, overtime, crack widens and pieces of rock fall away

  salt cracking

  biological - plants grow in cracks
• chemical weathering examples:

  carbonation - acid from sea breaks down rocks (chalk etc.)

  hydrolysis - acidic rain breaks down rock

  oxidation - rocks broken down by oxygen
• mass movement: downhill movement of material under the influence of gravity
• types of mass movement:

  sliding - loosened rock + soil tumble down the slope.

  weakened steep rocks, heavy rain infiltrates soil and into rock, heavier saturated mass falls away, slide begins, descent aided by lubrication from wet rocks

  slumping - saturated rock slides down a concave/ curved slip plane

  rockfalls - large amount of rock loses contact with cliff face