A tiny island with many concentric zones around it. Adele Island, off Australia’s north coast... The modern island is the dark central area, made up of a series of beach ridges built by sands from the surrounding sandbank during storms. The highest point is little more than 12 feet above sea level on this grassy but treeless island. A solar-powered lighthouse appears as a tiny white dot in the high-resolution image at the north tip of the island (arrowed). The island has been classified as an Important Bird Area because it is a breeding site of world importance for Lesser Frigatebirds and three other species...