The kidnapping was witnessed by the shepherd Eumolpus and the swineherd Eubuleus; I do not know if they told Demeter this.
Either Helios or Hecate, or sometimes both
Demeter discovered what happened to her daughter, Persephone, when she learned from Hecate, the goddess of magic and witchcraft, that Persephone had been taken by Hades to the Underworld. Hecate guided Demeter to Helios, the sun god, who revealed the truth about Persephone's abduction. Heartbroken and enraged, Demeter searched for her daughter, leading her to neglect the earth and cause a great famine until she was reunited with Persephone.
Demeter asked poseidon to make the most buteful animal the world has ever seen
Demeter was not consulted about it, her daughter had been kidnapped by her husband Hades - which Hades had gotten the permission of Zeus first.
As she was the Greek goddess of agriculture, she would like to see ripe fruits, beautiful vegetables, good harvest and of course her daughter, Persephoné (who had been kidnapped by Hades and Demeter got her back but while her daughter was away she neglected the fields and the plants, and there was winter for a long time; when she found her daughter, Demeter brought spring with her again)
She was dejected when Persephone had been taken from her and happy every time (once a year) when Persephone was back with her.
After Hades stole Demeter's daughter, Persephone, Demeter went into depression and the harvest never came. However after a deal had been struck and Persephone could be returned for six before she went to live with Hades again for six month -and so on- the seasons were created. When Persephone left, Autumn and Winter followed. And when she returned Spring and Summer begun
The most popular is in which Hades asks Zeus for Persephone's hand in marriage and is granted it, while Demeter does not know and when Persephone is taken he offers her the pomegranate to eat in the Underworld. Which she does, thus she can't leave the Underworld save for part of the year. Demeter has been searching for her daughter, and finds out where Persephone is, and demands her return; when Zeus and Hades argue that Persephone must stay in the Underworld for a portion of time; Demeter lets the world feel her wraith in the first winter.
demeter has been living before the world...see more
Demeter punished the Earth by causing famine in her grief over the loss of her daughter Persephone. While her actions may have been understandable, it can be debated whether it was justified to negatively impact all living beings on Earth because of her personal sorrow.
Yes, Demeter and Hestia as sisters; Zeus, Hades, and Poseidon as brothers.
She does not know, she probably was frantic with worry that her daughter had been either killed (as some goddesses and gods do die in Greek myth) or that she'd been stolen away (which she was) and in great danger (which she was not).