Weathering is the wearing of rocks and the breaking down of rocks. For example if you look in a river bank and pick up a rock and feel it and if it is smooth then all the water has been pushing on the rock. Weathering is slow. There is two types of weathering it is erosion and deposition. Moving water ,ice,and wind creates erosion and deposition.
Chemical weathering takes place in most rocks. Chemical weathering is common in areas where there is a lot of water. That is because water is important to chemical reactions. When it's warmer it is easier for chemical weathering. Chemical weathering scales the rocks and makes them into tiny pieces.
Physical weathering is the breaking down rocks without changing its composition. One example of this type of weathering is when ice forms in cracks along the streets or sidewalks and the water pushes against the rock and goes into a crack and freezes. When the water freezes ,it expands and the crack gets even wider. Eventually the rock will break apart. Nothing has changed as far as the composition of the rock. It is the same rock just in smaller pieces.