Avataars of Lord Vishnu
Lord Vishnu in his tenth incarnation as Prithu came into existence after the body of King Vena . Lord Vishnu took this incarnation as per the wishes of the sages. The earth had concealed all the vegetation s within her and as a result the whole land had become barren. To protect the humanity, Lord Vishnu took incarnation as Prithu by milking the cow (earth). This is considered that as a very supreme incarnation, because the earth has remained full of vegetation s after that.