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When savannahs become deserts and deserts turn into savannahs
"The desert moves" and was moving thousands of years ago. Archaeological finds in southern Egypt provide evidence that the present-day desert must once have been a landscape of savannahs in which it was possible to hunt, graze livestock and harvest wild grain. In a 25 meter deep salt lake in the remote region of north east Chad it was possible to take a drilling sample which gives a complete record of climate and environmental changes over the last five thousand years and can show, for example, whether there was a dust storm or plague of locusts in the region in summer 1664 BC. The microscope image shows whether a corn of sand was transported to the present-day desert by wind or by water.
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