Niijima is a volcanic island. It emerged from the Pacific Ocean one month ago, about 600 miles south of Tokyo. It is still rather small -- just 13.8 acres according to a recent report. It rises 60 to 80 feet above sea level.
The picture above was taken Dec. 8 by the Advanced Land Imager on NASA's Earth Observing satellite. The greenish color in the water surrounding the island is caused by volcanic minerals and gases mixing with the sea floor sediment, according to a NASA report.