Pandipedia entry
The Island That Comes and Goes
Derwentwater in Cumberland has an island that is not always there. A section of the lake's peaty bottom rises to the surface from time to time, floats for a while, and later settles back down.
The explanation the book offers is unglamorous and entirely convincing: the mass is swollen and buoyed up by gas produced as the vegetable matter in it decomposes. Push a boat-hook into the island and carburetted hydrogen comes up out of it in abundance[1].
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