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1. The Gangetic Valley's ________ soil and the adoption of iron research in this area increased agricultural production.
2. On the north, the Ganges, on the west, the Sone, and on the east, the Champa river surrounded the _______ empire.
3. Ashoka conducted a military effort to conquer ________, a coastal kingdom in east-central India, eight years after attaining power around 270 B.C.