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| 51. | atmosphere of the Earth |
| 地球大气 |
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| 52. | age of the Earth |
| 地球年龄 |
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| 53. | origin of the Earth |
| 地球起源 |
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| 54. | Caring for the Earth |
| 关心地球 |
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| 55. | figure of the Earth |
| 地球形状 |
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| 56. | revolution of the Earth |
| 地球公转 |
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| 57. | general survey of earth |
| 地球概貌 |
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| 58. | albedo of the earth |
| 地球反射率 |
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| 59. | history of the earth |
| 地球史 |
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| 60. | dynamics of the earth |
| 地球动力学 |
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