Stalactites (from the Greek stalaktos, ‘oozing out in drips’) hang from cave ceilings. Water oozes out of cracks in the ceiling and as it evaporates it leaves behind tiny deposits of calcium carbonate. Initially these create hollow tubes. Eventually the tubes clogs up, and water runs down the outside, creating the typical stalactite shape.
Cave Location Details
Mammoth Cave System: Kentucky, USA: Longest cave system, 550 km (340 miles) of chambers & passages.
Krubera: Georgia: Deepest discovered-1710m (1mile) deep. Discovered in 2002.

A mature hurricane consists of bands of thunderstorms spiraling round a calm central area called the eye. An average hurricane can reach up to 970 km (600 miles) in diameter and contain hundreds of storms. They produce winds up to 250 km/h (150 mph), intense rain and ocean surges. They can last for weeks and travel thousands of miles.

Most of the underground fresh water on the planet is stored in it. Some sedimentary rock contains the fossil remains of past life. Also, because sedimentary rock is made up of the remains of earlier rock, it provides clues to the Earth’s biological history.