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

  Leaching is removal of materials in solution or suspension downwards as water move vertically through the soil body by force of gravity. Leaching results into movements of soluble and suspended materials in water percolation. Leaching involves two forms: Elluviation - which is washing out of materials in solution or suspension from the overlying parts of the soil body; and  Illuviation - which is accumulation of materials taken from the overlying parts of the soil body. RELATED POSTS 9 CONDITIONS FAVOURING IRRIGATION FARMING IN EGYPT 5 CAUSES OF RURAL-RURAL MIGRATION IN KENYA 10 AIMS OF KILOMBERO VALLEY IRRIGATION SCHEME 4 FEATURES OF MAP STATEMENT SCALE 10 ADVANTAGES OF OIL PRODUCTION IN THE MIDDLE EAST 7 DISADVANTAGES OF AIR TRANSPORT 10 PROBLEMS FACING COFFEE FARMING IN KENYA IMPACTS OF POVERTY ON ENVIRONMENT 10 PROBLEMS FACING COTTON FARMING IN UGANDA COMPARISON BETWEEN FISHING IN KENYA AND JAPAN

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. FACTORS THAT INFLUENCE THE RATE AND NATURE (TYPE AND CHARACTER) OF WEATHERING. THE NATURE OF THE PARENT ROCK. Mineralogical composition of the rock: the mineral composition of the rock is very important in  determining the rate and character of weathering from rock to rock e.g. igneous rocks are more prone to  chemical weathering because they are formed under conditions very different from those operating on the  earth’s surface and they are therefore not chemically stable on the earth’s surface.  So when rocks come  into contact with water, chemical weathering sets in at a very fast rate when exposed onto the earth’s  surface. Examples of such rocks which can easily be weather are basic igneous rocks with low silica  content. On the other hand, rocks with high silica content like granitic ...