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Virtual reality differs from traditional displays in that computer graphics , various displays and input technologies are integrated to give the user a sense of presence or immersion in the virtual reality ( Held & Durlach , 1992 ; Sheriden , 1992 ; North & North , 1994 ) . In Jamaica and Africa , contorting melodies , integrating foreign layers , recycling beats , and then dancing to it all is a given . But responding to Bush 's speech , Ahmadinejad lashed out at " those who are up to their elbows in the blood of the people , who are implicated everywhere where there is war and oppression , who start wars in Asia and Africa , killing people by the million . As table 1 shows , only Asia and Africa , both victims of colonialism , failed to share in the rising prosperity . Positioned at latitude 25 degrees north , off the coasts of Florida and Africa , measurements will be made from just below the sea surface to the ocean floor 5km below . ( North & North , 1994 ; North , North & Coble 1995 ) .