Original air date: 1 March 1984
A more detailed timeline can be seen below
Introducing next episode:
“…But these small islands of life are under constant threat. If the wind veers and blows steadily from another direction, nothing can stop the sand. Eventually the advancing dunes may well overwhelm this oasis, and then this small world that’s been brought into existence in the desert by the presence of water will be extinguished. The force that drives the dune, of course, is the wind, and the wind, too, has its own world of living organisms. Many of the spiders and beetles and other insects that live in the oasis arrived by air. And many of the plants, too, coming as windblown seeds or carried by birds. And that world, the world of the wind and the sky, we’ll be exploring next time.”