As Permafrost Thaws,increased Microbial Activity in the Soils Results in the Release

As permafrost thaws,increased microbial activity in the soils results in the release of more carbon to the atmosphere.More carbon in the atmosphere accelerated the greenhouse effect.As temperatures increase further,more carbon can enter the atmosphere,causing temperatures to increase even more.This is an example of a(n)

A) positive feedback loop.
B) negative feedback loop.
C) threshold.
D) static state.
E) equilibrium state.

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