A negative effect of global warming is the melting of ______,which refers to soil that has been at or below the freezing point of water for more than two years and will be irreversible once it starts.
A)ground frost
B)solid frost
C)perma frost
D)grime frost

Question

Quizplus · Accepted Answer

Permafrost is a layer of permanently frozen soil that covers about one-quarter of the Northern Hemisphere. As temperatures rise due to global warming, permafrost is slowly melting, releasing large amounts of trapped carbon into the atmosphere and creating a positive feedback loop that accelerates the effects of global warming. This melting is irreversible once it starts and can cause land to sink, damage infrastructure, and release harmful greenhouse gases.

A Negative Effect of Global Warming Is the Melting of ______,Which