1. Frost Shattering
H2O entering joints and cracks in rocks freezes and the crack expands  rock eventually falls apart

2. Thermal Expansion
Rock is heated all day and expands. At night the rock is cooled and contracts  breaks apart

3. Exfoliation/Sheeting
Rock that was once under intense pressure in the earth  now exposed and pressure is released  rock layers peel off as pressure is reduced

4. Solution
As rain falls through the atmosphere it binds to CO2  carbonic acid.
This acid dissolves rock like limestone

5. Oxidation 02 dissolved in H2O can change Fe into Iron Oxide.
Iron Oxide comes into contact with H2O and carries it and deposits onto surfaces
Often turns rocks red

6. Hydrolysis
Carbonic acid acting on silicates and dissolves material  gets carried in H20.
This process can create soils of great depth as rock layers continue to dissolve