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).
Nigerian Americans are Americans who are of Nigerian ancestry. According to a 2006 American Community Survey, there were about 266,000 U.S. residents claiming Nigerian heritage. Nigerian Americans makeup a significant part of African immigration to the United States.he top 10 US states with the largest Nigerian populations are: 1  Texas - 43,969. 2  New York - 30,056. 3  Georgia - 29,505. 4  Maryland - 23,005. 5  California - 20,358. 6  New Jersey - 18,511. 7  Illinois - 12,413. 8  Florida - 7,220. 9  Minnesota - 6,794. 10  Virginia - 6,181.