The quality or state of being calcareous; the degree to which something contains calcium carbonate.
From calcareous + -ness (noun suffix creating abstract nouns), forming a noun describing the property of being chalk-like or limestone-based.
Scientists measuring 'calcareousness' in ocean sediments can actually tell the climate history of Earth—higher calcareousness in certain layers means warmer oceans with more shell-forming creatures living in them.
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