context: Population has outstripped the supply of freshwater, usually from rainfall. The northern atolls get 50 inches (1,300 mm) of rainfall annually; the southern atolls about twice that. The threat of drought is commonplace throughout the island chains.
question: মার্শাল দ্বীপপুঞ্জের জন্য বিশুদ্ধ জলের প্রধান উৎস কী?
answers: rainfall