81. Size of slack coal
82. The instrucment that record the earthquake
83. The streak of calcite
84. Hardness of siderite
85. When magma erupts at the surface called
86. The rocks produced Chiefly, breaking up the pre existing rocks and deposition of broken material in the form of layers
87. The composition of mineral in Pbs called
88. In ultra basic igneious rocks the sillica % is
89. Specific gravity of sand stone
90. A part of any stream or rock that is exposed to surface known as
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