Where were the empires of ghana, mali, and songhai located? (site 1)

What is the relationship between surface winds in the northern and southern hemisphere?

Prices for products became more affordable as a result of new forms of ,witch got things to market faster and cheaper

Which of the following policies is an example of a command-and-control policy? a. subsidies to education b. maximum levels of pollution that factories may emit c. tradable pollution permits d. none of the above is an example of a command-and-control policy.