View Full Document. Ultimate base level for all rivers is sea level - Longitudinal profile: way to show a riverâs overall vertical drop. Shows the elevation of its channel bottom from the headwater areas to its downstream termination (the riverâs mouth).
The population is as diverse as it is large, with some 250 ethnic groups. Nigeria's three largest ethnic groups are: Hausa-Fulani (29 percent of the population), Yoruba (21 percent) and Igbo, or Ibo (18 percent).he population is as diverse as it is large, with some 250 ethnic groups. Nigeria's three largest ethnic groups are: Hausa-Fulani (29 percent of the population), Yoruba (21 percent) and Igbo, or Ibo (18 percent).
Kennedy UdeGod, Nigerian born&brought up.Lived, schooled and travelled within at least 15 states Answered Jan 16, 2016 The word Nigeria was created from the combination of Niger and Area but Niger is Latin for black and as such and surprisingly enough for a lot of people Nigeria actually means Black Area- which is ironic since it is the most populous black nation in the world.