41. If granite is the original rock then what is its metamorphic rock?
42. The crest of fold where strata are bent up to form an arch is called
43. The gas formed by blowing a mixture of stream and air through a bed of hot coal is known as
44. If it is found that a younger bed completely covers up and advances much beyondthe limits of the underlying beds then the structure is called
45. The mineralized vertical solution joints in carbonate country rock containing valuable deposits of metallic and non-metallic minerals is known as
46. The delicate instrument that records earthquake is known as
47. Polymorphs of carbon is
48. The different geological periods during which mineral deposits were formed in abundance in certain sectors of globe are commonly known as
49. A fault that runs at some angle between the dip and strike of the bed is called
50. India's coal is approximately A percentage of World's coal reserve. A is given by
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