The Qinghai-Tibet plateau, dubbed ''the roof of the world'', is moving north-east at seven to 30 millimetres a year, a Chinese researcher has announced. ''The plateau is moving because it's being pushed by the Indian plate,'' said Dr. Tan Kai, a researcher with China Seismological Bureau who is collecting data for a Global Positioning System (GPS) survey in the towering Kunlun Mountains in Golmud city of northwest China's Qinghai province. Dr. Tan and his colleagues have found that Lhasa, on the southern end of the plateau, is moving 30 mm a year north-east at an angle of 38 degrees. The Kunlun mountains in the central plateau is moving 21 mm a year. The Qilian mountains further north is moving between seven and 14 mm a year, at an angle of 80 degrees.