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 whale skulls - were used to ask for "whaling magic". The best known of these is the Yuquot Whalers Shrine, associated with the great Mowachaht chief Maquinna. The neighbouring Nuu-chah-nulth and Makah peoples used similar shrines to pull drift whales to them. proposed that drift whales might have formed a considerable summer food resource for people living on the coast of what is now Oregon, before contact with Europeans. Peoples that value whale meat and blubber have kept an eye out for drift whales, and traded the rights to them, for example bartering access to inland fishing rivers. Specific people may