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.
Related to tropical zone: Temperate Zone, polar zone. also called tropical zone or torrid zone, all the land and water of the earth situated between the Tropic of CancerTropic of Cancer, parallel of latitude at 23Â°30' north of the equator; it is the northern boundary of the tropics.