Soil samples. Collection of differently coloured soils from Socotra Island in the Indian Ocean. Socotra (Soqotra) is part of Yemen and lies off the coast of Somalia in the Gulf of Aden. Soils are differently coloured depending on the mineral content of rocks from which they are derived and according to the amount of decayed plant matter they contain. The arrangement illustrates the efforts of biologists to order the chaos of nature, from the random distribution of soils at the top to the regular arrangement at the base.
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