The Mobile Earth
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The bits of the Earth that interest us most are those we can see— the land, the sea and the air. But they are just hangers-on. The essential part of the Earth is what lies beneath our feet. This is what matters most in discussing the future of the Earth, and so this is where we have to start. As with the Sun, the first question must be: what is the Earth like today? The problem, of course, is trying to discover the properties of something that you cannot see into. The deepest boreholes that have been drilled still only penetrate an infinitesimal distance into the Earth. We need some kind of probe that can penetrate deep into the Earth’s interior. There is such a probe, and it was identified a century ago: it is earthquakes.
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- B.J. Skinner and S.C. Porter, The dynamic Earth (John Wiley, Chichester; 2000).Google Scholar