Stories, songs, and legends of this kind describe laws of nature and such natural processes as the change of seasons of the year, their connections with each other and with the existence of human beings. Nature is often described in terms of the human family; in one central example (found in many songs and stories), the sun is called the mother, the moon the father, and stars the sisters of human beings. Lithuanian mythology is rich in gods and minor gods of water, sky and earth. Holy groves were worshipped, especially beautiful and distinctive places – "alka" were selected for sacrifices for gods.