When organisms living in seawater grow shells, the ratio between the isotopes of oxygen (18O/16O) trapped in their shell is dependent on the sea temperature
Why might geologists collect these sea shells from deep-sea sediments that are Pleistocene in age and measure their oxygen isotope ratios?
A) The organisms live near the surface, so their oxygen isotope ratios record surface temperature during Earth's great climate fluctuations of the ice age.
B) They want to know how metabolism of the organism affects the oxygen isotope ratios.
C) They might want to know how cold the water was at the seafloor in the past.
D) The organisms live in the photic zone, and so photosynthesis must be the main factor in the oxygen content.
A
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A) the outlet B) the flood plain C) the trunk stream D) the drainage divide E) the head waters
After forty to sixty years of service, every nuclear plant will have to be ___________, or retired, and taken apart.
Fill in the blank(s) with the appropriate word(s).
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What will be an ideal response?