Answer:shale
Explanation: pressure compacts the shale into slate, and heat hardens it
They really help in the process of Africa's state building, creating commercial networks between parts of the continent, and introducing literacy ( especially on northern part of Africa)
They also controlled the sea route between Asia and Africa and managed to maintain the relationship between Africa and the middle east
<u>Answer:</u>
The immigration laws of Arizona said that people who were entering Arizona without the documents that were required for immigration were considered to be a criminal and that the police should intervene in the matter and take required actions for a person who appears to be doubtful.
For these laws of Arizona, Andres Gamboa thought that these were based on racism and differentiation among the people of different countries who wanted to immigrate in Arizona.