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Recent scientific investigations have revealed that the southerly movement of the Sahara remains at under 10 kilometres per year. |
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There is scientific evidence to suggest that the Sahara is expanding southwards at a rate of roughly 10 kilometres a year. |
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The rate at which the Sahara is expanding southwards has been scientifically established as not exceeding 10 kilometres a year. |
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According to recent scientific data, the Sahara is moving in a southerly direction at a rate just under 10 kilometres a year. |
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It has been scientifically established that the Sahara is expanding southwards at a rate of up to 10 kilometres a year. |