Biological Action - The movement of plant roots and of animals between rocks., Oxidation - Oxygen in the air reacting with some of the components of the rock., Dissolving - When rain falls, soluble materials in the rock dissolve in the water and are removed from the rock., Carbon Dioxide - Dissolves in water to form a weak acid which reacts with some minerals in the rocks., Water - The continuous and repeated movement against the surface of rocks gradually breaks away smaller pieces of rock., Ice - When water collects in crevices in rocks and freezes it will increase the pressure on the crevice and result in small pieces of rock breaking away.,

Soil Formation

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