Read the passage and decide whether theses statements are True (T) or False (F).
Located in the heart of the Phong Nha-Ke Bang National Park, Son Doong cave, which is more than 200 metres in width, 150 metres in height and approximately 6.8 kilometres in length, was explored by the British Cave Research Association during 2009-2010 and it has been open to the public since 2013. st is believed to have been formed 2-5 million years ago. Son Doong Cave has been recognised as the largest of its kind in the world by three international record-keeping organisations - Guinness, the Association World, and WorldKings. Holding important scientific values, in terms of geology, geomorphology and ancient climate, the cave has been favoured by many scientists and science channels worldwide. The eco-system inside Son Doong is unique as it is large, and it even has its own localized weather system. Rare limestone cave pearls are scattered in dried pools, and the largest stalagmite ever found stands 80 meters tall. According to an initial study from the Vietnam Academy of Science and Technology, besides 161 species of flora found inside Son Doong, the cave is home to 300-million-year-old coral fossils which are valuable for the analysis of geological layer changes through times. (Nhan Dan Online, 2019)
1. Son Doong cave is located next to Phong Nha Ke Bang National Park.
