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).
Culture of Nigeria. The culture of Nigeria is shaped by Nigeria's multiple ethnic groups. The country has 527 languages, seven of them are extinct. Nigeria also has over 1150 dialects and ethnic groups. The four largest ethnic groups are the Hausa and Fulani in the north, the Igbo in the southeast, and the Yoruba predominate in the southwest.