61. Which one of the following minerals occurs abundantly in the Earth's crust?
62. The acceleration due to gravity at the equator
63. "Mohs' Scale" is used to indicate the ________
64. The latitude of a place expresses its angular position relative to the place of ________
65. The Earth turns through 360° in 24 hours. Each 15° longitude represents ________
66. World's longest land border is between which two contries?
67. What is the term used for the day on 23 September when day and night are equal throughout the world?
68. When it is noon along 82° 30' longitude, along what degree of longitude it will be 6.30 a.m.?
69. The Gutenberg discontinuity is between ________
70. The approximate circumference of the Earth is
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