A cave is a natural opening in the Earth’s surface, specifically enormous to allow humans to enter and travel within. Described as a chambered area in a cliff. The formation occurs when rainwater filters through cracks and soil on the surface of the Earth. Absorbing carbon dioxide during this process. Ultimately it mixes together creating a weak carbon acid solution. This solution then erodes the limestone under the surface, creating passageways. Over a million years, the flooding of the rainwater mixtures, lower immensely.
The Jenolan Caves is located in New South Wales, Australia. The cave itself is complex, packed with multiple underground archways, and rivers. The Jenolan Cave has been physically changing and forming for at minimium 340 million years, being around 90 to 100 million years old.
Blue Grotto is a sea cave, located on the coast of Capri, Italy. Famous for it's captivating bright clear blue waters.
Fingal's Cave is located in Isle of Staffa, in Scotland. The cave itself is 12 metres wide, and the water depth is 7.6 metres. A special factor about the Fingal's Cave is it's physical features including the size, along with the natural walkway.