Geography & History Notes | KCSE, NECTA, ZIMSEC & GCSE

WEATHERING refers to the process of weakening, breaking up, and disintegration of the rock that forms the surface of the ground and that lie exposed to the weather. weathering is divided into 3 types namely; physical or mechanical weathering, chemical weathering, and biological weathering TYPES OF WEATHERING physical or mechanical weathering Mechanical or physical weathering is any of the various weathering processes that cause the physical disintegration of the exposed without any change in the chemical composition of rocks. 6 processes of physical/mechanical weathering. Frost action (freeze/thaw effect) this is the breaking of rock due to pressure exerted by freezing water into rock cracks or joints. When water freezes its volume increases. alternate freezing and thawing, therefore, exert pressure on the sides of cracks and joints in rock and this leads to the weakening and disintegration of rock. Pressure release this occurs when pressure is released when rock buried deep down in th...

what is weathering in geography? WEATHERING refers to the process of weakening, breaking up, and disintegration of the rock that forms the surface of the ground and that lie exposed to the weather. The process results from forces of weather such as changes in temperature, frost action, and rain action. The following are the importance of weathering to human life. Weathering is the initial stage in the formation of soil. It breaks down the initial rock mass into smaller fragments thus preparing the rock material for the formation of the soil. The depth of the soil, therefore, depends on the extent to which rocks have been weathered. Weathering produces other natural resources such as clay which is used for making bricks. Clay is also used for pottery. Another natural resource found from weathering is bauxite which is aluminum ore used in the extraction of aluminum Another significance of weathering is that weathering weaken rocks making them easier for people to exploit for example by m...

Weathering is the breakdown of rocks at the earth's surface, by action of rainwater, extremes of temperature and biological activities. It does not involve the removal of rock materials.  Chemical weathering is the weakening and subsequent disintegration of rock by chemical reactions.   The following are 5 processes of chemical weathering Hydrolysis this is chemical breakdown of substance when combined with water. Therefore hydrolysis is break down of rock due to reaction between rock and water. The most common example of hydrolysis is feldspar which can be found in granite changing to the clay. When it rains water seep down into the ground and come into contact with granite rock. The feldspar crystals within the granite reacts with the water and are chemically altered to form clay minerals which weaken the rock . Oxidation this is weakening of the rock due to its reaction with oxygen.The oxidation is the process which cause rust. It occur when oxygen in water reacts with ...