Part one of term paper
The land below us is always in motion. Plate tectonics studies these restless effects to give us a better understanding of the Earth and its past. New molten rocks are poured out in the form of magma from the mid-ocean ridges. The rock is recycled and re-entered back into the earth in deep ocean trenches through convection current. The conve ...

Part two of term paper
... drift. During the Earth’s existence, the magnetic fields have never been stable. Solidified magma containing magnetic imprints reveal periods of time when the Earth’s magnetic fields have actually been reversed. Convection is caused by non-uniform temperature in a fluid and density differences. This continuous convection is the cause of plate movement. Each complete cycle, called a convection cell, drives the plate in the direction of the cell. How does a ‘solid’ mantle move? The mant ...