41. Hardness of Hornblende
42. Radio active metals are
43. Line of true dip is steepest line in the inclined surface and always right angles to the strike
44. The lignite fields at
45. The lava flows, they errupt to surface called
46. When a coal is heated to a temperature above 600°C is said to be
47. Colour of biotite is
48. Meghalaya coal fields formed during the period of
49. Crystallisation take place by
50. Mineral deposit limitted by two/more/less parallel, plans, a shape is typical of sedimentory rock.
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