Look at the diagram on page 80 to help you understand how the edges of the Pacific plate and the North American plate converge 2.1.4 Lab Modeling a Plate Boundary

Which of there factors contributed most to us westward expansion in the second half of the nineteenth century?

Drastic boundary changes can occur for all of the following reasons except for a. a shift in the way a river flows b. the collapse of a government system c. a conflict between two neighboring groups d. one country's decision to sell land to another country select the best answer from the choices provide

The lines marked by the letters a, b, and c on the map above represent a. chains of volcanoes b. earthquake fault lines c. thin strips of heavy forests d. major rivers that flow from north to south