At the waterline, limestone fails first. The Twelve Apostles, carved from Miocene seabed rock, appear to defy the surf; in truth, each pillar is a temporary outcome of the coastal forces that separated it from the cliff. Salt spray flashes, then vanishes. Beneath it, the shore keeps working.Their grandeur is misleading. Marine abrasion grinds sand and rock against the base, while hydraulic action ...More