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Author Question: How can the oxygen-isotope ratio in the calcium carbonate shell remains of organisms found in ocean ... (Read 213 times)

neverstopbelieb

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on: Jul 13, 2018
How can the oxygen-isotope ratio in the calcium carbonate shell remains of organisms found in ocean sediment provide information about past sequences of glacier advances and retreats?

Question 2

The thermosphere is where charged particles from the sun interact with air molecules to produce ____.
 A) ozone
  B) auroras
  C) radio waves
  D) humidity


Smiles0805

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Reply #1 on: Jul 13, 2018
Answer to Question 1

Because certain organisms that once lived near the surface of water can only live within a narrow range of temperatures, the distribution and type of organisms within the sediment indicate the temperature of the surface water. Most of the oxygen in seawater is composed of 8 protons and 8 neutrons in its nucleus, giving it an atomic weight of 16. However, about one out of every thousand oxygen atoms contains an extra 2 neutrons, giving it an atomic weight of 18. When ocean water evaporates, the oxygen-18 tends to be left behind. Consequently, during periods of glacier advance, the oceans, which contain less water, have a higher concentration of oxygen-18. The shells of marine organisms are constructed from the oxygen atoms exiting in ocean water, so determining the ratio of oxygen-18 to oxygen-16 within these shells yield information about how the climate may have varied in the past. A higher ratio of oxygen-18 to oxygen-16 in the sediment suggests a colder climate, whereas a lower ratio suggests a warmer climate.

Answer to Question 2

B


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neverstopbelieb

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Reply #2 on: Jul 13, 2018
Thank you


Smiles0805

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Reply #3 on: Jul 13, 2018
No problemo


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