| 1 | Most of the guyots are located in the Pacific Ocean. | |
| 2 | Scientists are puzzled by the guyots ' curiously flat tops. | |
| 3 | They decided to make Pingdingshan a large coal base. | |
| 4 | It is a tabletop mountain with sheer 400-metre highcliffs on all sides. | |
| 5 | There are several important centers of coal production in Henan, including Pingdingshan, Yima, and Jiaozuo. |
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