CH₁ (ppbv) CO2 (ppmv) 300 280 260 240 8220 200 180 0 800 700 600 500 400 300 Валовить 100,000 200,000 300,000 400,000 500,000 600,000 Age (yr BP) -380 -400 -420 -440 8D ice (96%)
The figure above shows the methane (top), oxygen isotope (middle), and carbon dioxide (bottom) levels from over 600 thousand years ago to present. This data was derived from ice cores. Which of the following statements is true as shown on this figure. CHOOSE ALL ANSWERS THAT YOU THINK ARE CORRECT
| a. |
This data shows that during interglacial periods, carbon dioxide levels are lower than during glacial periods |
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| b. |
This data demonstrates that interglacial periods have occurred approximately once every 100 thousand years on earth during the last 600 thousand years |
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| c. |
This data is one of the most important records for our understanding of past climate changes on earth |
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| d. |
This data demonstrates that greenhouse gas concentrations and temperatures have been closely linked ("correlated") during the last 600 thousand years on earth. |
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