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[removed] D.Because carbon is an essential element in organic materials, and it is released into the atmosphere by plants, during photosynthetic activities

Question 2 of 10

10.0 Points

Carbon dioxide is considered a greenhouse gas because it can

[removed] A.Absorb green frequencies well

 

[removed] B.Absorb IR radiation well

 

[removed] C.Absorb UV radiation well

 

[removed] D.Because it can reflect EM radiation well

 

Question 3 of 10

10.0 Points

Why are greenhouse gasses important to life on earth?

[removed] A.Without them, the earth’s atmosphere would be too thin to support life

 

[removed] B.Greenhouse gasses react with water vapor providing water solutions ideal for plant growth

 

[removed] C.Without them, the earth’s average temperature would be too low to sustain life.

 

[removed] D.Greenhouse gasses protect the earth from UV radiation

 

Question 4 of 10

10.0 Points

Considering that there are other more powerful greenhouse gasses in the atmosphere, why did CO2 gained so much attention in the past decades?

[removed] A.Because CO2 levels have dropped about 50ppm in the last century, in which time the average global temperatures increased by 1º C, and numerous studies indicate strong correlations between the two events

 

[removed] B.Because anthropogenic CO2 levels into the atmosphere have risen almost 70ppm in the last century, in which time the average global temperatures increased by 1º C, and numerous studies indicate strong correlations between the two events.

 

[removed] C.Because, among the greenhouse gasses, CO2 is the only compound that is strictly linked to life on earth.

 

[removed] D.Because CO2 is the most stable greenhouse gas, and numerous studies indicate strong correlations between this instability and its high UV ray reflectivity

  
 

 

Q5

Plants remove carbon from the atmosphere through the process of photosynthesis. During this process, CO2 is converted into sugar, and makes up ______% of the glucose molecule.

[removed] A.50

 

[removed] B.30

 

[removed] C.45

 

[removed] D.40

 

 
 

 

Question 6 of 10

10.0 Points

How many kilograms of carbon are stored in a 160 kilograms log?

[removed] A.72

 

[removed] B.80

 

[removed] C.23

 

[removed] D.56

 
 
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