Provided by: Shirley Zhou, Darien High School

Summary authors & editors: Jim Foster; Shirley Zhou

The above is a photo of the Three Sisters in the Blue Mountains of Australia; Meehni (922 m), Wimlah (918 m), and Gunnedoo (906 m). These haggard pinnacles of sandstone were once part of the cliff at Echo Point at Katoomba. Over time, the cliff has been eroded by wind and water. Compromised by vertical joints and the softer layers of shale within them, massive blocks of sandstone are eventually undercut, break off and topple down the slopes. Today, only the Three Sisters are left standing. Thousands of tourists visit here every day to witness this breathtaking view. The Three Sisters has profound spiritual significance for the Aboriginal people. Photo taken on June 28, 2006.