by Will Adams · HarperCollins · tapa blanda · ISBN 9780007250875
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In 318 BC in the deserts of Libya, Alexander the Great is buried as only a God should be, placed in a Crystal Sarcophagus in a catacomb of chambers, each packed with diamonds, rubies and gold. In 2007 underwater archaeologist Daniel Knox has been on the trail of Alexander's Gold ever since he can remember. When a tomb is uncovered on the construction site of a new hotel, Daniel believes he has found the clue to what he has been working towards for years. But the discovery has alerted two of the most dangerous men in the world, and Daniel is now a marked man.
The Adams–Williamson equation, named after Leason H. Adams and E. D. Williamson, is an equation used to determine density as a function of radius, more commonly used to determine the relation between the velocities of seismic waves and the density of the Earth's interior. Given the average density of rocks at the Earth's surface and profiles of the P-wave and S-wave speeds as function of depth, it can predict how density increases with depth. It assumes that the compression is adiabatic and that the Earth is spherically symmetric, homogeneous, and in hydrostatic equilibrium. It can also be applied to spherical shells with that property. It is an important part of models of the Earth's interior such as the Preliminary reference Earth model (PREM).
