All of the Following Would Result in a Positive Feedback

Multiple Choice

All of the following would result in a positive feedback loop except _____________-.

A) an increase in global temperatures increases evaporation of surface waters,which increases the amount of water vapor in the atmosphere
B) the melting of ice sheets in Greenland causes rocks that had previously been covered in ice and snow to be exposed to sunlight
C) an increase in volcanic activity causes sulfate aerosols to be released into the atmosphere
D) an increase in global temperatures causes people to use more electricity for air conditioning