.Page 2 of this Deep Earth Academy’s overview describes how evaporation of seawa

Question

.Page 2 of this Deep Earth Academy’s overview describes how evaporation of seawater and build-up of land ice during glacial climatic episodes results in seawater that is enriched in ________.

Therefore, ocean microfossils that lived during those glacial episodes have calcite shells with relatively higher proportions of that oxygen isotope compared with those ocean microfossils that lived during interglacial climatic episodes. [ ]18O [ ]16O

Examine the top graph in Figure 3. Isotopic studies of bottom-dwelling foraminifera fossils recovered from deep-sea sediment cores from sites described in the Figure 3 caption show that with the onset of PETM there was a rapid ________ in the carbon isotope ?13 value (note scale on left increases upward). This is indicative of a large increase in the concentration of the atmospheric greenhouse gases carbon dioxide (CO2) and methane (CH4). [ ]increase [ ]decrease

Explanation / Answer

First of all i want to make your attention that here you have mentioned figure 3 in the part of the question but you have not posted it. so we are providing the rest answer. so lets begin with this-

during the evaporation of seawater and build up of land ice during the glacial climatic episodes which result in the formations of the sea water that is enriched in oxygen.

therefore ocean microfossiles that lived during those glacial episodes have calcite shell with the relatively higher proportions of that oxygen compared with those microfossils that lived during interglacial climatic conditions 160.

this is indicative of a large increase in the concerntration of the atmosphere greenhouse gases carbon dioxide and methane as it increase it.

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