What type of evidence have scientists collected and studied from deep ice cores that shows a correlation between changes in global climate with methane and carbon dioxide levels?
A. Bivalve fossils
B. Layers of volcanic ash
C. Variations in ice layer color and thickness
D. Bubbles of atmospheric gases
Answer: D
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Critical Thinking
What will happen if humanity's ecological footprint continues to be greater than the earth's ecological capacity?
What will be an ideal response?
Among non-wood forest products, ________ has/have the highest economic value on world markets
A) mushrooms and truffles B) gums and resins C) pharmaceuticals D) ginseng E) wild nuts and fruit
What are the major IPCC projections for climate changes in the 21st century?
What will be an ideal response?
What color would the sky be if air molecules selectively scattered only the longest wavelengths of visible light?
a. white b. blue c. red d. black e. violet