Which important resource did the empire of Ghana trade its gold for? copper
cotton
ivory
salt

Salt

Explanation:

It said in the edge lessons that the Ghana empire traded for salt because they had little salt and you need salt to survive

salt

All through the era there where many items traded like ivory, copper, and also salt. Also i checked on edge and it was right.

b hope this

productive most commonly means: achieving or producing a significant amount or result.

explanation:

productive can also mean:

these depend on how the word productive is used. most likely productive will mean   achieving or producing a significant amount or result.