[ 475 ] Physical Science GED ® TEST SCIENCE FLASH REVIEW • • • • • • • • • • • • • • • • • • • • • • • • • • • • • • • • • • • • • • • • • • • • • • • • • • • • 1940 1950 1960 1970 1980 1990 2000 2010 Year 400 375 350 325 300 275 CO 2 8.38 8.33 8.28 8.23 8.18 8.13 8.08 8.03 pH Atmospheric CO 2 (ppmv) Seawater pCO 2 (µatm) Seawater pH In this graph, which of the following statements is true? A. As the years passed, atmospheric CO 2 decreased, seawater pCO 2 remained the same, and seawater pH decreased. B. As the years passed, atmospheric CO 2 increased, seawater pCO 2 decreased, and seawater pH remained the same. C. As the years passed, atmospheric CO 2 increased, seawater pCO 2 increased, and seawater pH decreased. D. As the years passed, atmospheric CO 2 decreased, seawater pCO 2 increased, and seawater pH increased.