61. The ash percentage in coal can be reduced by
62. Quartz hardness number
63. An Anticline fold may be defined as fold that
64. Baryte commonly found with ores of
65. Example for placer deposit
66. Colour of muscavite is
67. Streak colour of Blende
68. Coal normally found in
69. The angular pebbles called
70. The sources of mineral deposits are
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