1.2: Weathering

1. Physical Weathering
   1. Temperature Change [Ice Wedging]
      1. Water collects in cracks in rock
      2. Water freezes
      3. When frozen, it expanded, causing a crack
      4. Repeats over and over, until splitting the rock
   2. Pressure Change [Exfoliation]
      1. Pressure increases outer layers of the rock peel away
   3. Wind, Water, And Gravity [Abrasion]
      1. Wind
         1. Can blast particles away from object
      2. Water
         1. Rocks are tumbled and worn out in the running water
      3. Gravity
         1. Rocks can crack during landslides
   4. Plant Growth
      1. Root digs into a small crack in the wall
      2. Roots expands as the plant grows
      3. Bigger crack forms
2. Chemical Weathering
   1. Oxygen Reactions [Oxidation]
      1. Different atoms combine with oxygen, making new materials
   2. Acid
      1. Precipitation
         1. Acid falls from the sky, burning rocks or objects in its path
      2. Groundwater
         1. Can burn minerals away from and object, depositing them somewhere else
      3. Living Things
         1. Plants can create acids, burning away the rock