A. Why do most Native Americans live in such concentrated groups in the American Northwest? Please help I don’t get this

The point where two air masses meet is called a

Which statement explains what upwelling causes? a. upwelling causes tides to rise and fall. b. upwelling causes changes in the direction of currents. c. upwelling causes nutrients, minerals, and tiny organisms to rise. d. upwelling causes currents in the pacific ocean to change direction. i think the answer is c.

Asap will mark geography final plz ! what are the benefits of international aid? (give me the right evidence )