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Earth sciences

Earth sciences

Self-sorting sand creates mysterious megaripples

09 May 2018
Ripples and dunes
Rippled dune: sand ripples on a dune in Morocco (CC BY-SA 2.0/Rosino)
If you go to a sandy desert or beach on a blustery day, you might see a range of topographic feature

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Tim Wogan is a science writer based in the UK
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