4.3 midpoint quiz
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Greenhouse effect
a natural process where certain gases in the atmosphere, like water vapor and carbon dioxide, trap the sun’s heat, warming the Earth to a habitable temperature
Greenhouse gases
Greenhouse gases are gases in Earth’s atmosphere that trap heat, including water vapor, carbon dioxide, methane, and nitrous oxide
Positive feedback loop
system where a change in a variable causes an effect that, in turn, amplifies the original change, moving the system further from its initial state
Negative feedback loop
a control system that counteracts a change to maintain a stable state, a process known as homeostasis
What greenhouse gases do
trap heat in the atmosphere
Why the greenhouse effect is important
Why the greenhouse effect is important
How humans have affected the greenhouse effect
increasing the concentration of heat-trapping gases in the atmosphere, primarily through the burning of fossil fuels
What ice cores tell us about the patterns of CO2 and temperature for the past 800,000 years
Earth’s temperature and CO2 levels have fluctuated, cycling between colder “ice ages” and warmer interglacial periods