Suggest how mechanical weathering could shape a river valley in the upper course

What is the lowest output value approached by the function f(x)=2x−5?

Plants can have a positive and negative effect on the rate of weathering

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.