How are limestone caves formed?
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Carbon dioxide in the air dissolves in rainwater to form a very weak acid, which can slowly dissolve soft limestone rock. Over thousands of years, water seeping into cracks in limestone rock dissolves so much that the cracks become holes.
Slowly the holes grow even larger and form caves. These may be many kilometers in length and very deep. Sometimes the roofs of huge caves collapse, forming narrow valleys or gorges.
The world's highest waterfall, Angel Falls, tumbles from the flat top of a hill, hardly touching the cliff face. It was discovered in 1935 by an American pilot, Jimmy Angel. It remained undiscovered for so long due to dense rainforest, and its remote location.
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Date Added: 09 December '11
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