• RELIEF OF NIGERIA
    REGIONAL GEOGRAPHY

    RELIEF OF NIGERIA

    Relief refers to the surface features of the land above the sea level. Relief of Nigeria can be grouped into two main classes which are lowlands and highlands. Lowlands: Lowlands refer to the areas below 300m above the sea level.   Areas of Lowland in Nigeria and their Altitude or Height The Sokoto plain in the North West (200 – 300m). The Niger-Benue trough/valley (100 – 300m). The Chad basin or Borno plain (100 – 300m). The Niger Delta (0 – 100m). The Cross River basin (120 – 180m). The interior coastal lowland of Western Nigeria (100 – 300m). The coastal plain (0 – 100m).   Rocks Associated with Lowlands…

  • VARIOUS METHODS OF REPRESENTING RELIEF
    PRACTICAL GEOGRAPHY

    VARIOUS METHODS OF REPRESENTING RELIEF

    The term relief refers to the elevation of land areas. In other words, relief of an area refers to the position and character of the highlands and lowlands. Thus, the methods of representing such relief on maps include the following: Contour: These are lines drawn to join places of equal height level or altitude. The sea level is taken as the starting point in all measurement in metres or feet. The height of a particular point is written on the line.   Contour Interval: In a particular map, contours are of equal intervals e.g. the above contour has contour interval of 100m.   Form Lines/Form Contour: These are lines drawn…

  • RELIEF AND DRAINAGE OF WEST AFRICA
    REGIONAL GEOGRAPHY

    RELIEF AND DRAINAGE OF WEST AFRICA

    The relief of West Africa can be grouped into three classes as follows: 1. The lowlands: These areas are below 300m above the sea-level and are made up of sedimentary rocks. The lowlands are further sub-divided into two: The interior lowlands: These are found in the inland delta (Mali), Chad basin and Niger-Benue trough (both in Nigeria), and the Volta basin (Ghana). Coastal lowlands: These are found near the coasts of some countries like Mauritania, the Gambia, Cote d’ivoire, Nigeria, Senegal, Sierra Leone, Liberia, Togo, Benin and Ghana.   2. The interior plateau: The average height of these areas range between 300-900m and are made up of basement complex rocks.…

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