71. Specific gravity of monazite
72. The ratio of volume of voids in a rock or soil to its total volume is known as
73. The geological age of gondowana rocks is believed to be during
74. These are wavy undulations developed in country rocks whenever the region is subjected to severe pressure or stress
75. The topographic depressions that accommodates lakes are known as
76. As per the sized gradation of coal, the size of rubble coal is
77. Cleavage plane of mica is . . . . . . . direction.
78. Crack in earth crust filled with mineral
79. Quartz crystallizes in . . . . . . . . system.
80. The mineral contains calcium carbonate are called
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