In 1968 the average salary of men teachers in maintained schools in England and Wales was Â£1,646. I estimate that the last two pay settlements have raised this figure to about Â£1,880. The comparable figure at 31st March, 1963, was Â£1,244.
Two main tectonic structures are spreading centers and subduction zones. Spreading centers occur at the boundary between two plates that are moving apart, called divergent plate boundaries. Here the plate motion opens a gap between the plates and magma from the mantle rises up through it.
Transitional Zone. a major global morphostructure located between the underwater continental margin and the ocean floor. Typical transitional zones are encountered along the northern and western margins of the Pacific Ocean, in parts of the Caribbean and Scotia seas, and in the northeastern part of the Indian Ocean. They consist of the basins of marginal seas, island arcs, and deep trenches.