What geographic feature led to the development of separate neighborhoods in ancient rome?

The earth's internal process which drives seafloor spreading is

This word for a bug or malfunction was popularized in the 1962 book into orbit by the mercury astronauts

Match the graph type to its description. 1. uses symbols to describe information pie 2. compares different quantities at the same point in time line 3. compares increases and decreases in a quantity over a period of time bar 4. shows the relationship of parts to each other and to the whole pictograph