Question

multiple choice 1 point
which of the following best represents a positive feedback loop?
co₂ increases → more plants grow → co₂ decreases
rising sea level → less flooding → more land protection
melting ice → cooler temperatures → ice reforms
melting ice → more dark water exposed → more heat absorbed → more melting

Explanation:

A positive - feedback loop is a process where the output of a system amplifies the initial change. In the case of "Melting ice → more dark water exposed → more heat absorbed → more melting", as ice melts, dark water is exposed which absorbs more heat, causing more ice to melt, thus amplifying the initial melting process. The other options represent negative - feedback loops or incorrect cause - effect relationships.

Answer:

Melting ice → more dark water exposed → more heat absorbed → more melting