What geographic obstacles made it difficult building the transcontinental railroad

Explain: plate tectonics and people.

Which of the following is defined as combinations of soil particles that vary in size and shape?

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