71. The imaginary line on the earth's surface, which closely follows the 180o meridian, is called the
72. The largest part of our hydrosphere is
73. The limit beyond which the stars suffer internal collapse is called the
74. The ground water that occurs when flow of the subterranean water is not confined by the presence of impermeable layers is called
75. The gulf that separates Finland and Sweden in Europe is
76. The largest continent in the world is
77. The landforms that are created by massive earth movements due to place tectonics are called
78. The largest production of mica in Asia is from
79. The latitude 'AA' on the map represents the
80. The largest fresh water lake of Africa, area wise is
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