National Geographic features a page and a set of images that describe the process of how nature weathers all sorts objects.
"Water, ice, acids, salts, plants, animals, and changes in temperature are all agents of weathering. Weathering describes the process of materials on Earth breaking down."
Modelers mimic weathering in a number of ways. They represent aging, dirt and grime with paint and washes. To mimic aging they may use paint and washes or they may introduce aging during the building process. Broken boards, missing windows, sagging roofs are all methods that the builder can incorporate into the building process. These methods are usully more effective in representing the passage of time and neglect than paint and washe methods.
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