What is the definition of negative feedback? (level1)
2 points
2
Question 3
3.
Is the scenario described below an example of a positive or negative feedback loop? (level 2)
Increase in evaporation creates more clouds that reflect more light away from Earth resulting in a decrease in temperatures and evaporation
2 points
2
Question 4
4.
Is the scenario below an example of a positive or negative feedback loop? (level 2)
Increased growth in vegetation also increases evaporation and decreases water runoff and infiltration resulting in more precipitation and increased plant growth.
3 points
3
Question 5
5.
Why are positive feedback loops dangerous for climate balance? (How can these feedbacks impact living organisms?) (level 3)
4 points
4
Question 6
6.
Select one of the following scenarios and using the whiteboard, make a diagram to show the feedback pattern that is described. Be sure to indicate if it is an example of positive or negative feedback. (simples sketches are great or you are welcome to use clip art in your diagram) (level 4)
1. Clouds. Clouds have an enormous impact on Earth's climate, reflecting about one-third of the total amount of sunlight that hits the Earth's atmosphere back into space. Even small changes in cloud amount, location and type could have large consequences. A warmer climate could cause more water to be held in the atmosphere, leading to an increase in cloudiness and altering the amount of sunlight that reaches the surface of the Earth. Less heat would get absorbed, which could slow the increased warming.
2. Precipitation. Global climate models show that precipitation will generally increase due to the increased amount of water held in a warmer atmosphere, but not in all regions. Some regions will dry out instead. Changes in precipitation patterns, such as increased water availability, may cause an increase in plant growth, which in turn could potentially remove more carbon dioxide from the atmosphere.
3. Greening of the forests. Natural processes, such as tree growth, remove about half of human carbon dioxide emissions from the atmosphere every year. Scientists are currently studying where this carbon dioxide goes. The delicate balance between the absorption and release of carbon dioxide by the oceans and the world’s great forested regions is the subject of research by many scientists. There is some evidence that the ability of the oceans or forests to continue absorbing carbon dioxide may decline as the world warms, leading to faster accumulation in the atmosphere.
4. Ice albedo. Ice is white and very reflective, in contrast to the ocean surface, which is dark and absorbs heat faster. As the atmosphere warms and sea ice melts, the darker ocean absorbs more heat, causes more ice to melt, and makes the Earth warmer overall. The ice-albedo feedback is a very strong positive feedback.
0 points
0
Question 7
7.
How do you feel you did on this test?
0 points
0
Question 8
8.
Based on the learning standard and success criteria:
Success Criteria:
I can determine what type of feedback loop applies to different scenarios learned in Earth Science B."
How do you feel about meeting this target? Choose where you fall on this scale:
0 points
0
Question 9
9.
Since starting to learn about feedback loops last trimester do you feel that you can apply it to other scenarios outside of what you have learned about in Earth Science? Ex) Body temperature control, food webs...etc?
0 points
0
Question 10
10.
Teacher Action! What can I do for you?
Examples:
- What improvements can I make for the next trimester?
- Can I add or do anything differently?
- Is there something I can help you with right now?