generate questions: 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.
How many millimeters of rain do the northern atolls of the Marshall Islands receive? {sep_token} What is the main source of fresh water for the Marshall Islands? {sep_token} What is the Marshall Islands often threatened with? {sep_token} How much more rain do the southern atolls get compared to the northern?