What did the berbers bring as a trade item that the west africans thought was as valuable as gold?

The president of american systems announces that all employees will be going on a trip to san francisco. some employees like the idea and some don't. according to the component of attitudes, these evaluations reflect the feelings of the employees.

Which features are created on the exterior of a volcano when it erupts? check all that apply. vent crater hot spot lava flow boundary

Which of the following statements best describes the concept behind labor unions?