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.
Weathering Weathering is the process by which rock materials are broken down by the action of physical or chemical processes. Mechanical weathering is the breakdown of rock into smaller pieces by physical means. (ice, wind, water, gravity, plants, animals) Chemical weathering is the process by which rocks break down as a result of chemical reactions. Water, weak acids, and air can cause chemical weathering.