The Great Rift Valley in Africa was created by .
A.
the movement of tectonic plates
B.
the spreading of the Sahara Desert
C.
the erosion of the Congo River
D.
the movement of glaciers during the last Ice Age

When did paul zoll develop cardiac pacemaker

What is zinn's approach to the study of history? what does he suggest occurs when history is told is the story of human progress?

One of the observations by someone who was present for roosevelt's speech was, "its clarity, logic, and sincerity struck us." quote one example from the text that you would describe as clear, logical, or sincere. explain the language in your chosen quote correctly, and tell why it can be considered clear, logical, or sincere.