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.
Convection Zone: Moving from a distance of approximately 200,000 Km (125,000 mi) lies the Convective Zone of the Sun. This zone is not dense enough to use radiative transfer of energy, instead, it uses thermal convection zones, in other words, it boils. Energy is carried through thermal columns to the surface of the sun and creates areas that we see as solar granulation and super granulation.