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Sponge diving
Sponge diving is the oldest known form of the original art of underwater diving. Its purpose is to retrieve natural sponges for human use.
==Background==
(詳細はspicules composed of calcium carbonate or silica. But two genera, ''Hippospongia'' and ''Spongia'', have soft, entirely fibrous skeletons. These two genera are most commonly used by humans.
It is unknown when exactly the sponge became an article of use. In Ancient Greek writings, Homer and Plato mentioned the sponge as an object used for bathing.〔http://www.seaspongecompany.com/pages/sea-sponge-history〕 Through trading, Europeans used soft sponges for many purposes including padding for helmets, portable drinking utensils and municipal water filters. Until the invention of synthetic sponges, they were used as cleaning tools, applicators for paints and ceramic glazes, and discreet contraceptives. However, by the mid-20th century, over-fishing had brought both the animals and the industry close to extinction.〔
Many objects with sponge-like textures are now made of substances not derived from poriferans. Synthetic "sponges" include: personal and household cleaning tools, breast implants,〔 and contraceptive sponges.〔
抄文引用元・出典: フリー百科事典『 ウィキペディア（Wikipedia）』
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