Answer: temperature differences in the mantle
Explanation: I took a quiz and got it right
NACL is the correct answer
The prevalence rate of a disease refers to the number of people in a population that are affected by a particular disease. The only two reasons why the number of this set of people will decrease is if a cure is found for the disease or if those affected are dying.
Cure or death will reduce the prevalence rate.<span />
Congress wanted to raise money for the treasury because the needed to pay off war debts.