A combination of two images of Sydney’s iconic Opera House, photographed at 6:15 am (top) and 12:30 pm on September 23, 2009. A huge outback dust storm swept eastern Australia and blanketed Sydney on Wednesday, disrupting transport, forcing people indoors and stripping thousands of tonnes of valuable farmland topsoil. REUTERS/Tim Wimborne (AUSTRALIA ENVIRONMENT CITYSCAPE IMAGES OF THE DAY)