PREVIEW
... 700-foot-high ice and snow wall.
At the beginning, he was very interested in the Great Wall, so he checked a lot of information and knew that the original shape of the Great Wall was a cliff formed by a basaltic rock pillar in western Iceland. Therefore, let him understand the great wonders that basaltic rock columns can form.
The Giant's Causeway in Ireland, the Devil's Tower in the United States, the Fingal Cave in Scotland, and the Stone Forest of Guilin Mountain in Nanjing Liuh ...
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