Prolonged dry periods in natural climate cycle. They are slow-onset phenomena caused by rainfall deficit combined with other predisposing factors.
    

concept

Saint Gangulphus. Coloured lithograph by J. Kravogl.

Single grain of sand, SEM

A naked man walks through a rocky landscape with a scythe; representing summer. Etching by J. Coelemans, 1703, after L. Cardi da Cigoli.

Diatoms hidden inside a grain of sand, SEM

Meningitis and malaria.

Climates of hunger : mankind and the world's changing weather / Reid A. Bryson and Thomas J. Murray.

Rain : a natural and cultural history / Cynthia Barnett.

Ozone.

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Droughts

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Meningitis and malaria.

Single grain of sand, SEM

Climates of hunger : mankind and the world's changing weather / Reid A. Bryson and Thomas J. Murray.

Rain : a natural and cultural history / Cynthia Barnett.

Ozone.