What is the common main idea in "a continent of ice"

Which of the following descriptions is an example of the curtual diffusion

How does an appellate court differ from a trial court a. an appellate court usually has a jury b. an appellate court decides issues of facts c. an appellate court examines more witnesses d. an appellate court reviews another courts decision

What did the u.s. want to build on the land acquired through the gadsden purchase?