One reason the cultures of north africa developed differently from the cultures of the rest of africa was that these areas of africa were separated by the a. arabian sea. b. sahara desert. c. congo river basin. d. great rift valley.

Explain: plate tectonics and people.

Reading graphs: unemployment us unemployment rate (1961-2011) identify the trends in the graph and then use the drop- down menu to complete each statement from 1961 to 1965 unemployment was in the mid-2000s through 2011. unemployment was percentage unemployed 1961 1971 1981 1991 2001 2011 year

Equilateral triangle pbj is inscribed in a circle as shown. determine the measure of arc pjb.