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A higher [tex]^{16}O/^{18}O[/tex] ratio in oceans indicates a __________ climate, whereas a lower [tex]^{16}O/^{18}O[/tex] ratio indicates a __________ climate.

Select one:
A. colder; warmer
B. warmer; colder
C. cooler; cold
D. warmer; hot
E. cold; hot

Sagot :

GinnyAnsweridn

Final answer:

Higher 180/160 ratio in oceans indicates a colder climate, while a lower ratio signifies a warmer climate. Oxygen isotopes in foraminifera shells serve as a proxy for past climate conditions.


Explanation:

Explanation:

Higher 180/160 ratio in oceans indicates a colder climate as during colder times, the ratio of oxygen-18 to oxygen-16 in seawater increases due to the storage of oxygen-16 in ice sheets on continents.

Conversely, a lower 180/160 ratio indicates a warmer climate as when the climate warms, glacial ice melts and increases the 180/160 ratio in water.

Oxygen isotopes in foraminifera shells provide a proxy indicator of past climate by reflecting the temperature and evaporation of seawater.


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