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).
On May 5, 2010, Adua passed away, and Dr. Goodluck Jonathan was sworn in as Nigeria's newest president. Nigeria's economy is one of the fastest growing in the world and is the second largest in Africa.Nigeria has the highest population of all African countries and is the eighth most populous in the world with a population of 590,400.n May 5, 2010, Adua passed away, and Dr. Goodluck Jonathan was sworn in as Nigeria's newest president. Nigeria's economy is one of the fastest growing in the world and is the second largest in Africa.