The correct answers are B) salt was used as a form of currency and D) salt was used to preserve food.
<em>The two factors that explain why salt was so valuable to West Africans are salt was used as a form of currency and salt was used to preserve food.
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Salt for West Africans was of the utmost importance. It served as a currency that allowed themto trade gold for salt. Yes, salt was a necessary element for people to survive because salt was used to preserve food. West Africans knew how to find grains of salt from the river beds after rainfall. People from the North of Africa had abundant gold, but no salt. So they often traded gold for salt with Western Africans. So the two factors that explain why salt was so valuable to West Africans are salt was used as a form of currency and salt was used to preserve food.
<span>no force is needed to overcome sliding friction once force has been applied to overcome the starting friction.</span>
Although this depends greatly on the project and student in question, the best option from the list would be "<span>D. how naturalization happens," since it is the narrowest and most manageable of the topics. </span>
It would be "Lake Victoria" that is the source of the White Nile River, although it should be noted that the exact point at which the two water sources converge is slightly disputed.
