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

Question

Quizplus · Accepted Answer

Positive feedback loops amplify changes and drive systems toward a tipping point where a new equilibrium is established. Choices A, B, and D describe processes that amplify an initial change, thus acting as positive feedback loops. Choice C, however, describes a process where sulfate aerosols, released by volcanic activity, can reflect sunlight away from the Earth, potentially cooling the planet. This acts as a negative feedback mechanism, as it works to counteract warming, not amplify it.

All of the Following Would Result in a Positive Feedback