Cave rainwater and groundwater charged with HCO (carbonic acid) and naturally occurring organic acids. The dissolution process produces a distinctive landform known as "karst", characterized by sinkholes and underground drainage. Limestone caves are often adorned with calcium carbonate formations produced through slow precipitation. These include flowstones, stalactites, stalagmites, helictites, soda straws and columns. These secondary mineral deposits in caves are called "speleothems". The portions of a solutional cave that are below the water table or the local level of the groundwater will be flooded. Lechuguilla Cave in New Mexico and nearby Carlsbad Cavern are now believed to be examples of another
Pete's Paradise Cave is possible to crawl through a tight hole for eight metres to come out at what was called "Pearl's Chamber" because of the presence of "Cave pearls". These are formed around grains of sand and they become coated with calcium carbonate which can grow in time to be 3 cm in diameter. A moving body of water is required to keep these pearls turning whilst they form. The last, and described as the best, chamber is the "Hall of Pillars". This chamber contains another perfect rimstone. This is one of three in this cave and only one of three in