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6. A layer of greenhouse gases - primarily water vapor, and carbon dioxide – acts as a ____blanket for the Earth, absorbing heat and warming the surface.
A. thermal
B. hot
C. heat
D. heating
7. Most climate scientists agree the main cause of the current global warming trend is human expansion of the greenhouse ____.
A. causes
B. effect
C. gas
D. damage
8. Certain ____in the atmosphere, such as carbon dioxide, methane and nitrous oxide, block heat from escaping.
A. effects
B. emissions
C. gases
D. layers
9. Carbon dioxide is released through ____processes such as respiration and volcano eruptions and through ____activities such as deforestation, land use changes, and burning fossil fuels.
A. human - natural
B. natural- human
C. man-made - ordinary
D. ordinary - man-made
10. A strong greenhouse effect will warm the oceans and partially melt glaciers, increasing ____.
A. temperature
B. sea water
C. sea level
D. pollution
A. thermal
B. hot
C. heat
D. heating
7. Most climate scientists agree the main cause of the current global warming trend is human expansion of the greenhouse ____.
A. causes
B. effect
C. gas
D. damage
8. Certain ____in the atmosphere, such as carbon dioxide, methane and nitrous oxide, block heat from escaping.
A. effects
B. emissions
C. gases
D. layers
9. Carbon dioxide is released through ____processes such as respiration and volcano eruptions and through ____activities such as deforestation, land use changes, and burning fossil fuels.
A. human - natural
B. natural- human
C. man-made - ordinary
D. ordinary - man-made
10. A strong greenhouse effect will warm the oceans and partially melt glaciers, increasing ____.
A. temperature
B. sea water
C. sea level
D. pollution
