Hawaiian islands. Composite satellite image of the islands of the state of Hawaii, USA, in the Pacific Ocean. From lower right to upper left the islands are: Big Island, Maui, Lana'i, Molokai, O'ahu and Kaua'i (twin island). The windward side (north east) of each island is lusher than that of the leeward sides (south west). This is due to the larger rainfall, which is brought by the wind. The islands lie on a 'hot spot', an unusually hot region of the Earth's mantle. An undersea volcano south east of Big Island may one day create a new island. The images were collected between 1999 and 2001 by the Enhanced Thematic Mapper Plus sensor (ETM+) on board NASA's Landsat 7 satellite.