premise: Mallorca and Menorca are blessed with the sort of natural and man-made attributes that entice countless millions of foreign visitors to descend upon them and to keep returning year after  the perfect deep blue and transparent turquoise of the Mediterranean Sea, 300-plus days of brilliant annual sunshine, hundreds of miles of coastline, secluded coves and wide bays, and a vast choice of cheap flights and accommodations.
hypothesis: The Mediterranean Sea is murky brown.