The student divers destination is a kelp farm near Sea Castle. Today, kelp has many uses. In Horizons they say it is a low cost fuel in the 21st century.
Originally, kelp was harvested as a source of potash for making gunpowder during World War I. Lately, however, the emphasis is on the production of algin, which serves as an emulsifying and binding agent in food and pharmaceutical products. My favorite use of kelp is in ice cream.
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