61. Pure Rocksalt colour
62. Essential constituent of marble, limestone or chalk.
63. When axial plane of a fold is vertical and either of the limbs have the same amount of dip then such fold is described as
64. It is an important constituent of granite and a chief constituent of sandstone where it occurs as broken form. Its hardness is 7 (seven). Name the mineral.
65. The traces of former living creatures, plants preserved in rocks.
66. Two theories are known to explain the heavy accumulation of vegetable and organic matter that formed coal seams. If one of the two theories is drift theory, what is the other?
67. During which transportation, the organism is decomposed and it loses nitrogen, oxygen and other volatile constituent?
68. Glaciers are masses of
69. Diamond hardness number
70. Oldest period in geological time scale.
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