31. The plane of contact between the two series of strata is called
32. Caking index is also known as
33. Trend of a rock bed on ground surface
34. The study of fossils within rock beds and their proper utilization in elucidating the past history of the earth is called
35. Most of the Indian diamond comes from
36. The mineral deposit in solid rock is called
37. The exact spot underneath the earth's surface at which an earthquake originates is known as
38. What is dunes?
39. Potash, felspar also known as
40. A natural mineral substance of iron oxide, clay and sometimes manganese is called
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