In Lakṣmaṇā’s svayaṁvara assembly, when the girl was to select her husband, Sāmba appeared. He was a son of Kṛṣṇa's by Jāmbavatī, one of Lord Kṛṣṇa's chief wives. This son Sāmba was so named because be was a pet child and always lived close to his mother. The name Sāmba indicates a son who is very much his mother's pet. Ambā means "mother," and sa means "with." So this special name was given to him because he always remained with his mother.
Other Books by Srila Prabhupada
Krsna, The Supreme Personality of Godhead
Personified dharma, he's inquiring from the cow. He's addressing cow, amba. Amba means mother. So cow is our mother. Why mother? Because from practical point of view, we drink milk.
So many mothers we have got, out of which, cow is also mother. Therefore she's addressed as amba. Amba means mother. Still in Gujarat province, they call amba. And in U.P., United States, er, United Province, in India, they also call amba, or in a broken language they call amma. Still... That is from very long time, mother is... Amba-devī. There is a... From Amba-devī, there is a big temple of Mother Durgā, Kālī, in Bombay. So this Amba-devī was pronounced by the Englishmens as Bamba-devī, and from Bamba-devī it has come to "Bombay." Actually, there is a big temple of Amba in Bombay. From that name, instead of Amba, they have become Bamba.
So one instruction is that the earth is addressed, "amba." Amba means mother. So the earth is also our mother.