The principal source of information on the Zoroastrian notions of the earth (and accordingly of its divinity) is the
Bundahishn, an account of the religion's cosmogony and cosmology completed in about the 12th century. According to that text, the earth was the third of the primordial creations, following that of the sky and
the waters, and before that of plants and fire. The creation of the earth is described in three stages: At first, the surface of the earth was a round, flat disk, floating in the center of the waters that filled the lower half of the "sky". Then, from its surface grew up the mountains, the tallest of these being
Hara Berezaiti whose outlying ranges encircled the earth and beyond which lay the world river
Aredvi Sura. Finally, during the time of the fourth creation (plants), the primordial tree grew up, and was the prototype of all plants (this tree is already alluded to in scripture as the Saena tree; in
Yasht 12.17 it is further described as the "Tree of All Remedies" because it bears the seeds of all healing herbs). The fifth creation is that of the primordial bovine
Gavaevodata from whose seed, marrow, organs and soul the earth is populated with animal life and the progenitors of the human race. In the
Shayest na-Shayest ("[what is] Proper and Improper"), an enumeration of the qualities that each divinity epitomizes associates Zam with "conclusiveness". In contrast,
Armaiti is identified with "fruitfulness". In the
Counsels of Adarbad Mahraspandan the author advises his readership not to take medicine on the day of the month dedicated to Zam. In the
Pazend Afrin-i haft Amshespand ("Blessings of the seven Amesha Spenta"), Zam is joined by Amardad, Rashn and Ashtad (
Ameretat,
Rashnu and
Arshtat) in withstanding the demons of hunger and thirst. The last hymn recited in the procedure for the establishment of a
Fire temple is the
Zamyad Yasht. This is done because the required 91 recitals in honor of the Yazatas would in principle require each of the 30 hymns associated with the divinities of the 30 days to be recited thrice with one additional one. However, the first three recited are dedicated to
Ahura Mazda, leaving 88, and 88 modulo 30 is 28, the day-number dedication of Zam. From among the flowers associated with the
yazatas, Zam's is the
Basil (
Bundahishn 27). According to
Xenophon (
Cyropaedia, 8.24),
Cyrus sacrificed animals to the earth as the
Magians directed. ==References and bibliography==