What does david smith mean by a “world city (aka global cities)” what role do they play in the global system?

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.

India's population is made up of percent hindus.

Which soil layers comprise the topsoil? o horizon a horizon b horizon c horizon