Secret of the Sahara

It may be dry and sandy now, but the Sahara desert used to look very different. Evidence buried deep beneath the dunes reveals that the landscape has been changing naturally over thousands of years. Earth Science - Weather - Learning Points. The Sahara is the largest hot desert on the planet, covering 9 million square metres. The air above the desert is so warm that the water vapor it contains cannot condense into rain. Radar technology shows that the Sahara has not always had a dry, unforgiving climate. At the end of the last ice age, an area of low pressure brought much rain to the Sahara, creating fertile river valleys. A Twig Context Film. Reinforce and extend the learning required by the curriculum. Twig’s context films show abstract concepts in action in the real world.