Scientists collected radioactive sand grains in the dark to understand when they formed.
The age of one of Earth's largest and most complex types of sand dune has been calculated for the first time.
Lala Lallia is located in the Erg Chebbi sand sea in south-east Morocco. It is 100m high and 700m wide with radiating arms. Prof Duller says this may be because they are so large that experts did not realise they were looking at one distinct dune. Prof Duller describes the mineral grains in the sand as "little rechargeable batteries". They store energy within the crystals that comes from radioactivity in the natural environment.The longer the sand is buried under ground, the more radioactivity it is exposed to and the more energy it builds up.
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