Thermal expansion, or insolation, is a very important
Heat spalling can be heat from forest fires and brush fires will cause
|Europe's forest fire http://news.bbc.co.uk/2/hi/in_depth/photo_gallery/3086059.stm
rock affected by heat spalling,
photo from http://www.geol.umd.edu/%7Ekaufman/ppt/chapter7/sld004.htm
|Daily temperature change in certain climates such as desert environments
can be a cause in mechanical weathering. Temperatures that occur from the day to the night could affect mechanical weathering. An occassional forest fire can be a source of mechanical weathering by over heating rocks causing exfoliation.