An example of a positive feedback loop is: a. birds migrating south in response to colder temperatures. b. a thermostat turning on the furnace as the temperature drops. c. melting Arctic snow exposing dark surfaces that heat up and cause further melting. d. predators eating most of their prey and then declining in numbers. e. a pond becoming more acidic as a result of pollution.
Biology · High School · Mon Jan 18 2021
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The correct example of a positive feedback loop is: c. Melting Arctic snow exposing dark surfaces that heat up and cause further melting.
Positive feedback loops amplify or reinforce a change in a system, leading to an escalation of the initial disturbance. In the case of melting Arctic snow, as the snow melts and exposes darker surfaces (like land or water), these surfaces absorb more sunlight, causing further warming and additional snow melting. This cycle continues, causing a self-reinforcing process of warming and melting, exemplifying a positive feedback loop in the context of climate change and melting polar ice.