Continental drift plate tectonics theory. In particular, the English geologist Arthur Holmes proposed in 1920 that plate junctions might lie beneath the sea, and in 1928 that convection currents within the mantle might be the driving force. Holmes' views were particularly influential: in his bestselling textbook, "Principles of Physical Geology," he included a chapter on continental drift, proposing that Earth's mantle contained convection cells which dissipated radioactive heat and moved the crust at the surface. 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
Ice Age: Continental Drift Ester Dean, performed by Keke Palmer. Both songs play during the credits and are not available on the soundtrack. "Chasing The Sun" can be found on The Wanted's 2012 American debut extended play, "The Wanted EP", while an alternate version of "We are (Family)" sung only by Keke Palmer is available for download. "Ice Age: Continental Drift" had its premiere on June 20, 2012, at the CineEurope film distributors' trade fair in Barcelona. It publicly premiered on June 27, 2012, in Belgium, Egypt, France, Switzerland, and Trinidad, and was released on July 13, 2012, in the USA. The film is