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Definitely natural. Maggi will tell you.
Life's a beach!
Thank goodness - so after restless nights and puzzling days Luit was the wise one who gave us the answer Wicked puzzle Anthony
The God of the sea is a clue from me, but this will put you out of your misery. http://en.wikipedia.org/wiki/Posidonia_oceanica
This species is found only in the Mediterranean Sea, occupying an area about 3% of the basin (corresponding to a surface area of about 38,000 km˛), representing a kind of key marine coastal ecosystem.A sign of a nearby occurrence of Posidonia is the presence of masses of decomposing leaves on beaches. Such plant material has been used for composting, but this is currently prohibited by Italian laws that restrict the use of marine algae and plants for this purpose.