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Helios, the sun god. He sees everything happen and when Demeter goes to look for Persephone, Helios tells her what happened
Hecate who heard the cry and led Demeter to Helios, and then led Demeter into the Underworld to Hades and Persephone.
When Demeter could not find Persephone, she killed all of the palnts, flowers and crops.
The plants and harvests died
Demeter is the great Olympian goddess of agriculture, grain, and bread, the prime sustenance of mankind. She also presided over the foremost of the Mystery Cults which promised its initiates the path to a blessed afterlife.
There doesn't seem to be one clear reason; piglets were sacrificed to purify oneself, which explains the sacrifice of a sucking pig before initiation into Demeter's Eleusinian Mysteries, but pregnant sows were also sacrificed to Demeter. This seems to be because they were pregnant, rather than because they were pigs, because pregnant sheep were also sacrificed to her. This is because they represent fertility, and Demeter is associated with the growth of crops (fertility applies to reproduction and crops).
Hardly. Demeter (and Ceres) was one of the most important deities because of her role in the fertility of grain crops (which were required to make bread, a staple food).
Demeter is the daughter of Cronus ruler of the Titans. She is the goddess of the harvest and her daughter, Persephone is married to Hades. The mythological explanation for winter was that Demeter was sad for the three months her daughter was required to spend in the underworld with her husband, so the whole world mourned with her.
Demeter stopped giving the ground water and soil then Zeus arrange persephone's visits
There was no "god of Demeter", Demeter was a Greek goddess.
Demeter
Demeter was not married. Demeter had two consorts in Karmanor and Iasion.