61. Weak plain found in minerals called
62. Vast cloud of hot gas from which different planets are originated known as
63. The hardness of plagioclase felspars
64. Altitude of bed defined by
65. Basalt is a rock of
66. An average coal when heated softens between at a temperature of
67. Hardness of the rock expressed by . . . . . . . .
68. High temperature carbonisation coal is heated in absence of air to a temperature of
69. Silica percentage present in magma is
70. Fossils generally found in
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