How had america changed during its first century

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

There is only one climate type in motion across the world at a time

If scientists only detect p waves in a certain layer of earths interior what does that tell us?