What's on Gerda's Mind?
This week Gerda wanted to know
Is it true that a sand dune cannot lean higher than 38 degrees before the sand start rolling down?
We spoke to Prof Tertius Harmse of UJ’s Faculty of Science Department of Geography, Environmental Management and Energy Studies.
This week Gerda wanted to know
Is it true that a sand dune cannot lean higher than 38 degrees before the sand start rolling down?
We spoke to Prof Tertius Harmse of UJ’s Faculty of Science Department of Geography, Environmental Management and Energy Studies.