Do not use dietary supplements that contain iodine in the place of KI (potassium iodide). They can be harmful and non-efficacious. Only use products that have been approved by the U.S. Food and Drug Administration (FDA).
Mammoth Cave, the world's longest known cave system. The following is a list of the world's 10 longest caves per length of documented passageways. Many passageways are still being discovered; this list is based on the latest verifiable data.he highest concentrations of long caves in the world are found in the Pennyrile of Southern Kentucky, USA, in the Black Hills of South Dakota, USA, and in the Yucatan YucatÃ¡n, Peninsula. mexico
The discovery was made in 1986 and the cave â because of the humid air that rises from it â has come to be known as Dragonâs Breath Cave. In its belly lies the largest underground non-subglacial lake in the world. So large, in fact, that divers have only been able to chart its depths to 430 feet. The lake has very clear water. Shielded from the elements, there is little wave action to kick up sediment.