Which of the following theories is supported by the discovery of magnetized rocks that do not match with earth's poles? continental drift theory mid-atlantic ridge theory pangea theory theory of plate tectonics

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.