Which theory states that earth lithosphere is divided into moving pieces

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.

What happens to rock when acid reacts with it?

How does central place theory explain patterns in the size and distribution of cities?