81.�They are fantastically diverse. They speak hundreds of languages and dialects. They comprise scores of ethnic group. They include highly industrialized economies and up and coming economies. They span half of the surface of the earth and are home to two-fifths of the world�s population.� The group of countries referred to here belongs to:

82.The average elevation of Tibetan Plateau above sea level is:

83.On which river is the world�s largest river island?

84.The Bermuda triangle lies in:

85.Consider the following climatic conditions (northern hemisphere) Month Temperature Rainfall in�C in cm J 3.9 4.7 F 4.4 5.7 M 8.3 8.2 A 14.4 9.2 M 20.0 9.2 J 23.3 17.7 J 27.8 14.5 A 27.8 14.0 S 22.3 12.7 O 18.3 7.0 N 12.2 5.0 D 6.7 3.5 These are most likely to be found in the natural regions of: