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.
A convection zone, convective zone or convective region of a star is a layer which is unstable to convection.Energy is primarily or partially transported by convection in such a region. In a radiation zone, energy is transported by radiation and conduction. convection zone, convective zone or convective region of a star is a layer which is unstable to convection.