GEOGRAPHY AND HISTORY

  Accordant drainage patterns. This is where the river and its tributaries flow according to the slope of the land the dendritic drainage pattern, annular, radial etc. on the other hand , discordant drainage pattern refers to a situation where there is no systematic relationship between the river and the underlying rock type and structure. Accordant drainage pattern Dendritic drainage pattern; dendritic comes from a Greek word Dendron which means tree like. This is a tree-like pattern of drainage in which tributaries’ coverage on the main stream from many direction and usually join the main river at acute angles i.e. less than 90 degrees. It develops in gently dipping areas which influence the speed of river flow. Conditions under which it develops It usually develops in areas of homogenous rocks with the same resistance to erosion e.g. granite It also develops in areas of gently sloping land It develops in areas of heavy precipitation or rainfall. All rivers and tributaries flow...

  The slope of the land The direction of the river Flow is generally guided by the direction of the slope since the flow of the water is controlled by gravitational force. There are rivers whose flow is exclusively determined by the direction of the slope.  Difference in rock resistance or hardness As the river erodes its channel, the nature of the bedrock becomes significant in determining how deep the river channel will become. If the river encounters a very resistant rock outcrop in its path, it may have to change its direction to circumvent it despite the nature of the slope. The rock structure along the river's profile. At certain stages in the course of the river, The arrangement of rock layers may influence the direction that the river takes. The river may change its direction due to the direction of the strike of an exposed rock layer despite the general direction of the flow. RELATED POSTS IMPORTANCE OF SOIL STRUCTURE     7 CHARACTERISTICS OF EQUATORIAL...

  Approach Define vulcanicity Explain the origin/ causes Identify forms of drainage Identify land forms resulting from vulcanicity associated with drainage with specific examples from East Africa. Answer Guide Volcanicity is the process through which gases and molten rocks are extruded onto the earth’s surface through a central vent or fissures. Volcanicity is brought about by radio activity and geo-chemical reactions in the interior generating intense/ great heat and pressure; melting mantle rock into molten rock/ magma. Some times molten magma forms as a result of Friction between moving rocks during plate movement and faulting. High pressure pushes out the magma into the crust; rising towards the surface through vent and lines of weakness such as faults created by tectonic forces/ movements such as faulting. The shape and the size of the volcanic landforms are determined by the chemical composition/viscosity of magma and the nature of volcanic eruption. That is acidic (high sili...