
Positive and Negative Feedback Loops
Authored by Lisa Thompson
Science
11th Grade
NGSS covered

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15 questions
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1.
MULTIPLE CHOICE QUESTION
1 min • 1 pt
As carbon dioxide levels in the atmosphere rise, the temperature of the Earth rises. As the Earth warms the rate of photosynthesis in plants increases, more carbon dioxide is therefore removed from the atmosphere by plants, reducing the greenhouse effect and reducing global temperatures.
Positive Feedback
Negative Feedback
Tags
NGSS.HS-ESS2-2
NGSS.HS-ESS3-5
NGSS.HS-LS2-5
2.
MULTIPLE CHOICE QUESTION
1 min • 1 pt
As the Earth warms, increased evaporation produces more clouds. Clouds increase albedo, reflecting more light away from the Earth. The temperature falls. Rates of evaporation fall
Positive Feedback
Negative Feedback
Tags
NGSS.HS-ESS2-2
3.
MULTIPLE CHOICE QUESTION
1 min • 1 pt
As the Earth warms, evaporation increases. Snowfall at high latitudes increases, icecaps enlarge. More energy is reflected by increased albedo of ice cover. The Earth cools. Rates of evaporation fall.
Positive Feedback
Negative Feedback
Tags
NGSS.HS-ESS2-2
NGSS.HS-ESS3-5
4.
MULTIPLE CHOICE QUESTION
1 min • 1 pt
As the Earth warms, polar icecaps melt, releasing large numbers of icebergs into oceans. Warm ocean currents such as the Gulf Stream are disrupted by additional freshwater input into oceans. Reduced transfer of energy to the poles reduces temperature at high altitudes. Ice sheets reform and icebergs retreat. Warm currents are re-established.
Positive Feedback
Negative Feedback
Tags
NGSS.HS-ESS2-2
NGSS.HS-ESS2-4
5.
MULTIPLE CHOICE QUESTION
1 min • 1 pt
Your body temperature rises as you walk around outside in Bangladesh on a hot afternoon. The sensors in your skin detect the rise in your surface temperature so you start to sweat.
Positive Feedback
Negative Feedback
Tags
NGSS.HS-LS1-3
6.
MULTIPLE CHOICE QUESTION
1 min • 1 pt
In some developing countries poverty causes illness and contributes to poor standards of education. In the absence of knowledge of family planning methods and hygiene, this contributes to population growth and illness, adding further to the causes of poverty; “a vicious circle of poverty.”
Positive Feedback
Negative Feedback
Tags
NGSS.HS-LS1-3
7.
MULTIPLE CHOICE QUESTION
1 min • 1 pt
As the Earth warms, ice cover melts, exposing soil or water. Albedo decreases. More energy is absorbed by the Earth’s surface. Global temperature rises. More ice melts.
Positive Feedback Loop
Negative Feedback Loop
Tags
NGSS.HS-ESS2-2
NGSS.HS-ESS3-5
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