Erosion is the general name for the processes that break down rocks (weathering) and the processes that carry away the breakdown products. Erosion is caused by many things such as water, wind, and glaciers. Water carries particles and transports them somewhere else. Wind picks up particles, usually in a dry area, and also transports them somewhere else. Glaciers have two different ways to cause glacial erosion: plucking and abrading. Chemical weathering is when chemicals (such as water, gases, etc.) break bonds which hold the rock together, causing the rocks to fall apart. Storms are a main cause of chemical weathering. Mechanical weathering is more a physical force, like abrasion, causing the rock to fall apart. Constant freezing and pressure are examples of what would cause mechanical weathering.
