Etiology. Cerebral palsy is relatively common, affecting 1 in 200 children. This number takes into account the full spectrum of the disorder, including milder cases, a broad definition of age of insult, and more complete case ascertainment.
Chemical weathering is the weakening and subsequent disintegration of rock by chemical reactions. These reactions include oxidation, hydrolysis, and carbonation.These processes either form or destroy minerals, thus altering the nature of the rockâs mineral composition.emperature and, especially, moisture are critical for chemical weathering; chemical weathering of rock minerals generally occurs more quickly in hot, humid climatic regions. Oxidation is the reaction of rock minerals with oxygen, thus changing the mineral composition of the rock.
mechanical or physical weathering is caused by agents of when natural processes which break down rocks or materials into sediments, or small rocks. Mechanical weathering usually only changes the shape and size of a rock.Chemical weathering is caused by changes in a rock's chemical composition. For example, in a limestone cave, when Hydrocloric acid or acid rain comes in contact with the stalagmites and stalacatites, it will break them down.Rusting is another example of chemical weathering. The process is called Oxidation.hemical weathering is caused by changes in a rock's chemical composition. For example, in a limestone cave, when Hydrocloric acid or acid rain comes in contact with the stalagmites and stalacatites, it will break them down. Rusting is another example of chemical weathering. The process is called Oxidation.