51. The process of wear and tear of the exposed country rocks is defined as
52. In metalliferrous deposit, the ore minerals generally occur in association with some non-metallic minerals known as
53. It is the property by virtue of which it allows water to travel through its pore-spaces or other openings and found to be proportional to the square of the diameter of the grains forming the rock.
54. The hollowsleft within the rock beds are filled up with mineral matter giving rise to
55. Water gas is a combination of
56. Which of the following reserve is least in quantity?
57. It is an irregularity where the bed thins out generally due to erosion by river or stream. This is known as
58. Amongst the vertebrates, remains of reptiles occur abundantly in the rocks of
59. The extensive lava-flows giving rise to flat-topped mountains and plateaus is known as
60. It is a compound of CaCO3 and MgCO3 in various proportions
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