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JAM-2014-GG-Q1-28-explanation

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Kumar Ayyasami
Presidency College, Chennai
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JAM 2014: 1. B. If great circle is on circumference, pole is in the center. If removed by 60 , then the pole also moves 60 from center. 2. A. A strike-slip fault occurring at the boundary between two plates of the earth's crust. 3. C. 4. C. The Wiechert Gutenberg Discontinuity, which separates the mantle from the core. 5. A. The limonitic minerals, forming the predominant constituent of the gossan, impart the capping a typical reddish brown or yellow colour and serve as a very useful guide in reconstructing the mineralogical composition of the material from which they have been derived. The Geological Survey of India, in collaboration with Hindustan Zinc Limited, have declared the Rajpura-Dariba Gossan a Geological Monument. 6. D. 7. B. 8. C. 9. D. 10. D. Clay is the most finegrained. 11. A. 12. D Top of Cuddapah Group of rocks is Proterozoic. Kaladgi basin is in Karnataka. Bhuj Formation consists of feldspathic, friable, brown ferruginous sandstone, kaolinitic shale, thin ironstone bands and occasional carbonaceous bands 13. B. Kamala Came Neatly Dressed To Pondy Bazaar. ( Kamlial, Chingi, Nagari, Dhok-Pathan, Tatrot, Pinjor, Boulder Conglomerate) 14. C. Perpendicular to N15 E 15. A. orthogonal thickness (t): The thickness of a folded layer, measured perpendicularly to parallel tangents to the inner and outer fold surfaces. 16. B. Deposition from hydrothermal solutions in open fissures can result in Comb Structures and in Symmetrically and Rhythmically Crustified Veins. 17. A 18. D. Some minerals can go from nearly clear in one orientation to nearly black at others and are in effect natural polarizing filters. Tourmaline is one such mineral and was sometimes used for that purpose. 19. C. The eclogite facies is the facies at the highest pressure and high temperature. 20. A. P has a high watertable; Q is the place where contour touches groundwater table and R has a lower watertable level. 21. C. Airy's theory assumes that across the lithosphere, the rock density is approximately the same, but the crustal blocks have different thicknesses. 22. C. Lopolith: a large saucer-shaped intrusion of igneous rock. Loccolith: a mass of igneous rock, typically lens-shaped, that has been intruded between rock strata causing uplift in the shape of a dome. 23. B. Wrong answer. Stegolophodon is an extinct genus of proboscidean not equidae family. 24. C. 25. B. Scour marks and flute casts are scours dug into soft, fine sediment which typically get filled by an overlying bed. Convolute bedding forms when complex folding and crumpling of beds or laminations occur. Cross-bedding (Cross stratification) is formed by the downstream migration of bedforms. Flaser bedding - fluctuating flows (start/stop currents)

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