Compared to the size of the entire earth, the crust is very
a. thick
b. deep
c. thin
d. wavy

Which item best completes the chart?

Which of the following encouraged westward expansion? a.the government decreased the price of federal land. b.each of these represents actions taken to encourage westward expansion. c.the government decreased the price of federal land d.the second national bank lowered the cost of borrowing money (reduced interest rates)

There are no written records of the first migration of humans to the americas? true or false