As such, this is only a review of the concepts that will not be discussed in GE 142. You can test the hypothesis of continental margin fit at an interactive site at Project Java , State University of New York, Binghampton. F.A. Vening Meinesz proposed the presence of convection currents in the crust after examining gravity surveys over trenches. This is remnant magnetism. Magnetic remnants are oriented as stereopairs on either side of mid-oceanic ridges.
Plates move along the top of the convection cell parallel to the direction of radial flow.
The movement of heat in the Earth is governed by Geothermal Theory . Sea floor sediments were relatively thin and thinned towards the mid-ocean ridge. This trend was followed by an increasingly younger-age to the plankton. Accuracy 3 cm. Their presence reflects the fact that belts are underlain by rocks much lighter than those at depth on either side.