31. Composition of crust
32. Fossiles not found in these-types of rocks.
33. The theory behind formation of plants
34. Hardness number of corundum.
35. Vitreous Lusture shown by
36. Mineral substance of iron oxide, clay and sometimes managenese called
37. Common cabonates are with
38. Hardness of Gypsum
39. Vein contains . . . . . . . .
40. India hold the position of coal producing country in the world.
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