from Part I - Ancient invaders
Published online by Cambridge University Press: 05 February 2014
Introduction
We live on a continually shifting planet as the continents on which we have built our lives drift across the Earth’s surface, a process which has changed the configuration of the continents throughout Earth’s history and will continue to do so. A world map 250 Ma from now will reveal a very different arrangement of continents in the northern hemisphere than that observed today. Earth science studies have revealed the processes associated with continental movement known as plate tectonics; we have learnt that the Earth is made up of lithospheric plates carrying the continents and oceans, which driven by mantle processes are in continuous motion (Skinner and Porter 1987).
A map of the Earth’s plates (Figure 11.1) reveals the relative movement of each plate and their interactions along their boundaries such as subduction around the Pacific Ring of Fire, spreading along the Mid-Atlantic Ridge and transform faulting at the San Andreas Fault (Skinner and Porter 1987; Kearey and Vine 1996). Our world has been, and will continue to be, shaped by the movement of these plates (Skinner and Porter 1987).
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