Used as evidence fro sea-floor spreading

Explain the cause for movement river valley civilization to early industrial centers

How much water is in the ocean in cubic kilometers

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