51. Sillica percentage in basic rocks igneious type
52. Light metals are
53. UHV range of F grade coal is in KCal/kg.
54. More or less horizontal sheet of ignious rock extend, laterally into strata, introducing between bedding planes
55. Large ignious rockmass, differs from batholith, basin shape called
56. Crude benzole . . . . . . . . yeild on coal.
57. Minerals contain iron and magnesium known as
58. In the low temperature carbonisation the coal is heated in the absence of air to a temperature of about
59. Dull appearance coals, most impure band of coal.
60. In a fault; the area in which coal seam missing called
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