81. Hardness of calcite
82. Mineral which gives black colour in streak plate
83. Average coal when heated, maximum fluidity at temperature between
84. H.G.I of coal means
85. Folds parallel limbs called
86. Plaster of paries made of
87. When an anticline and syncline coincides
88. Mineral of economic value, repays extraction from the earth
89. Coal is formed in the order of
90. Specific gravity of plagioclase felspars
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