Contour lines on a topographic map, connect areas with

Which of the following is not a challenge to instituting sound global environmental policies? a. most changes are inexpensive and easy to implement. b. elected leaders who support unpopular environmental issues often are not re-elected. c. economic considerations outweigh environmental ones in many societies. d. there is no way to enforce international environmental agreements.

Acontinental polar air mass foms in

According ti the following map, what are the most common mineral resources found in the united states?