A. Tourists can explore Son Doong Cave daily throughout the year.
B. The cave was formed about 2 to 5 million years ago.
C. It was formed by river water eroding away the limestone underneath the mountain.
D. Some of the stalagmites in Son Doong Cave are about 70 metres tall.
A
Dẫn chứng: In August 2013, the first tourist group explored the cave on a guided tour. Permits are now required to access the cave and are made available on a limited basis. Only 500 permits were issued for the 2015 season, which runs from February to August.
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