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Demeter's daughter, persephone was kidnapped by hades and kept in the underworld, during that time demeter killed all of the plants on earth, zeus was worried so he talked with hades who returned persephone. however, zeus and hades had made a deal a the got persephone to eat a pomegranet while in the underworld, which meant that she was claimed by hades. when demeter found out the zeus and hades made this deal she was furious and when persephone is forced to go to the underworld demeter kills off most of the plants until persephone returns. the time while persephone is away is called winter and when she returns it is known as spring.