As one increases in altitude, the temperature tends to:

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 is the difference between emigrate and immigrate? ?

What would be the distance of all the planets to the sun in astronomical units?