Examine the influence of vulcanicity on drainage in East Africa
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...