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Weathering and erosion Mr Boland Geography What are the differences between the the two sets of mountains. Why are they like this? The reason that the Irish mountains are smaller are because they are constantly been worn away (denuded) by the forces of weathering and erosion. Denudation is carried out by both weathering and erosion. Weathering The breaking down of rocks that are exposed to the weather/climate. Can be: 1. Mechanical Weathering. 2. Chemical Weathering. Breaking up of rocks into smaller parts by 1. Frost 2. Sudden Temperature Changes 3. Plants & Animals Causes rocks to be dissolved by - Rain Erosion What have these three pictures got in common???? Erosion Involves the breaking down of rock by the force of: 1. Moving Water (River & Sea) 2. Moving Air (Wind) 3. Moving Ice (Glaciers) -These rocks are carried & eventually dropped elsewhere.