91. An outcrop of rocks in the form of a patch of strata surrounded by newer beds on all sides
92. Mineral which is not scratched by knife.
93. Find the gaseous fuel avaialble from coke.
94. Colour of Rocksalt
95. Ultrafine coal particles size are cleaned by a process known as
96. Low ash and high sulphur content coals are
97. Most impure band of coal, having friable, drill appearence called
98. Protodyakonov strength number of coal.
99. Colour of sphalente is
100. Conglomerates occurs in
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