IMAGINE… long before dinosaurs roamed Earth, the limestone hills in the Kinta Valley, Malaysia, were nothing but a balmy sea where corals and single-celled organisms thrived. They were complex life forms known to have existed during the Palaeozoic era 570 million years ago. These life forms took lime from the sea to make their shells. When these creatures died, their shells made up thick masses of lime mud and all in time crystallised into limestone. Limestone can be dissolved by rainwater, which picks up carbon dioxide from the air and soil and turns the limestone into calcium bicarbonate. The dissolving process happens along joints where the water finds its way down. Some joints form sinkholes and these become vertical chimneys and horizontal galleries or in short, they become caves.....
