What in the book to read Ceres and Proserpina then answer the question. What natural phenomenon is explained in this story?

"Ceres and Proserpina" is a Roman myth about the abduction of Proserpina by Pluto, the god of the underworld. This story explains the change of seasons, as Ceres, the goddess of agriculture and Proserpina's mother, allows the earth to become barren in her grief during the winter months when her daughter is in the underworld, leading to the arrival of spring when Proserpina returns.