Australia’s Twelve Apostles, defined by Mother Nature Australia’s Twelve Apostles is a collection of limestone stacks carved by Mother Nature as erosion took its toll. They are up to 50 m (160 ft.) high. From the erosion, the soft limestone cliffs turn into caves in the cliffs. Later, these caves carved into arches. Eventually, the arches collapse, leaving the limestone stacks standing. It’s anticipated that the existing headlands will eventually turn into new limestone stacks. Did you know there are at least two tourist attractions in the world named “Twelve Apostles”? Both are provided to mankind with the compliments of Mother Nature. The gap between the Cliffs, known as Great Ocean…