71. Colour of Auqite
72. The ratio of volume of voids in a rock to its total volume called
73. The compound of CaCO3 and MgCO3 called
74. The formulae for calculation of non cooking coals useful heat values.
75. Plotanic rocks formed at a depth of in k.m.
76. Older rocks are thrust over new ones by lateral compression, the broken strata over laps each other the fault called
77. The size of ultra fine coal particles are
78. An ore body, in that rock predominant in area, which contains' the ore body
79. Out crop of rocks surrounded by older rocks and therefore entirely separated from main mass by denudation.
80. Apatite hardness number
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