A TEACHING kit on the new airport that includes a song extolling ''moving the mountains, filling in the sea and opening up the land'' has outraged environmentalists. The kit for primary school students has been produced and distributed by the New Airport Projects Co-ordination Office and features a video, song and teaching materials. These describe the effort to flatten and extend Chek Lap Kok island, reclaim land at West Kowloon and Central, build a new town on north Lantau, and build a road and rail network from Central to the airport. But the Green Lantau Association and Friends of the Earth say it is one-sided, and that environmental impacts include destruction of ecological habitats, worsening water quality and likely air pollution. ''It's appalling propaganda that they are issuing,'' Lisa Hopkinson of Friends of the Earth said. ''They can present the good side of the airport project, but they don't have to whitewash what's happening to the environment.'' Fabian Pedrazzini of the Green Lantau Association, who wrote to the Education Department to complain, said: ''The kit says the new airport frees 300,000 people from the noise of aircraft in Kowloon, but there's absolutely nothing about the destruction of north Lantau. Not a single word.'' The Green Lantau Association has offered to distribute material explaining the environmental impact. Acting principal inspector of the Education Department, To Ka-yan, said the department was considering the proposal. Mr To said it had nothing to do with the preparation or distribution of the kit, although the department was represented on the advisory committee on its preparation. The New Airport Projects Co-ordination Office, which was in charge of producing the kit, said it wanted to give children basic information and relate this to the curriculum which includes infrastructure. A spokesman said teachers were recently given information on the environmental aspects of the project. She added the song about moving mountains and filling in the sea was intended to ''help children to remember'' the projects.