During glacial periods, the concentration of carbon dioxide in trapped air bubbles in glacial ice is __________ when compared to the concentration during interglacial periods.
a. lower
b. the same
c. higher
Answer: C
During glacial periods, the concentration of carbon dioxide in trapped air bubbles in glacial ice is __________ when compared to the concentration during interglacial periods.
a. lower
b. the same
c. higher
Answer: C