В Китае обнаружены 49 гигантских карстовых воронок

Forty-nine vast sinkholes have been discovered in the mountains in Hanzhong city of northwest China’s Shaanxi Province. The discoveries were made during a survey conducted over the past four months. Sinkholes are a type of natural cave with a diameter and depth of over 100 meters. They contain one or more significant vertical shafts, rather than being conventional horizontal caves. Sinkholes typically form in limestone landscapes as a result of long-term erosion by water. Most can only be negotiated safely with the use of ropes or ladders.Subscribe to us on Youtube:https://goo.gl/lP12gADownload for IOS: https://itunes.apple.com/us/app/cctvnews-app/id922456579?l=zh&ls=1&mt=8Download for Android: https://play.google.com/store/apps/details?id=com.imib.cctvFollow us on:Facebook: https://www.facebook.com/cctvnewschinaTwitter: https://twitter.com/CCTVNEWSGoogle+: https://plus.google.com/+CCTVNEWSbeijingTumblr: http://cctvnews.tumblr.com/Weibo: http://weibo.com/cctvnewsbeijing