when the earth heats up , it expands.
when the earth cools down, it shrinks.
Paul, you assume lots, and you are also assuming that heating, or cooling changes,
are quickly transmitted through hundreds and thousands of miles of rock,
to effect the sort of changes you are talking about.
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But, they’ve measured the change in temperature, for the crust of the planet, recently.
Discussed back
in 2008 here:
“Table 2 indicates an integrated heat flux into the ground at least an order of magnitude smaller than the warming of the oceans, but on the same order of magnitude as observed within the atmosphere and various parts of the cryosphere during the latter half of the 20th century.”
http://www.ldeo.columbia.edu/~jsmerdon/papers/Beltrami_et_al_Journal.pdf
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While the oceans have warmed the most, over the past 50 years:
The Continental Lithosphere has warmed
more than the Atmosphere!
~
"This further supports the conclusion that the observed
warming of Earth during the last fifty years has been truly global
and extends upward into the atmosphere
as well as downward into the Earth’s oceans, cryosphere and continental crust." -
Beltrami et al., 2002