The Mid-Atlantic Ridge is also
illustrated on the stamp from Tristan da Cunha. Molten rock from the
earth's interior oozes out of fractures and causes the earth's mantle
to spread about an inch each year.
The face of the earth has
changed dramatically over the course of the millenia. From Pangaea to
Lauasia and Gondwanaland; from ice ages to global warming; from
thermal convection to plate techtonics we know some of the forces that
have acted on the earth. The stamps from Jersey show us what the
effects of those forces may have been. From 16, 000 to 4,000 B.C. we
see the effect of the filling of the Atlantic basin near the coast of
France, gradually raising the level of the sea to an approximation of
the present levels around the island of Jersey.