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Reference.org
Geologic temperature record
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<p>The geologic temperature record are changes in <a href="/facts/Earth/HLLmDfj0">Earth</a>'s <a href="/facts/Environment_(biophysical)/PNzMrGrz">environment</a> as determined from <a href="/facts/Geology/WGvVRIYF">geologic</a> evidence on multi-million to billion (109) year time scales. The study of past temperatures provides an important paleoenvironmental insight because it is a component of the climate and <a href="/facts/Oceanography/LtrG6peD">oceanography</a> of the time. </p>