Below you can find the Until the 1970s this city's islands were sinking an average of 1/5 a year Jeopardy Words Answer. The answer to Until the 1970s this city's islands were sinking an average of 1/5 a year has 6 letters. This clue belongs to the Italian cities category and is part of Jeopardy Word Level 1127. If you scroll near the bottom you will find other clues and answers part of level 1127