 Holmes' proposal resolved the phase disequilibrium objection (the underlying fluid was kept from solidifying by radioactive heating from the core).However, scientific communication in the '30 and '40s was inhibited by the war, and the theory still required work to avoid foundering on the orogeny and isostasy objections.Worse, the most viable forms of the theory predicted the existence of convection cell boundaries reaching deep into the earth that had yet to be observed.