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
Drift to the north Recent censuses have shown a slowing of the rate of drift, with increasing numbers of North Islanders heading to the South Island's popular scenic regions such as Central Otago. Drift to the north Drift to the north is a term used in New Zealand to refer to the internal migration of people from the South Island to the country's main metropolitan area, Auckland, in the northern North Island. The term is especially common in the cities of Christchurch and Dunedin, university cities whose graduates frequently head either to Auckland or the country's capital Wellington (also in the North Island) after