| 46. |
The sidereal month may be defined as |
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| 47. |
The soil used for cutting bricks, use in the construction of houses is |
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| 48. |
The shallow seas found in the Atlantic basin include the |
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| 49. |
The study of human geography includes study of |
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| 50. |
The snow line of the Rocky Mountains of the USA is about |
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