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 _    _     ______    ______   _    _     _  _   
| \  / ||  /_   _//  /_____// | || | ||  | \| || 
|  \/  ||   -| ||-   `____ `  | || | ||  |  ' || 
| .  . ||   _| ||_   /___//   | \\_/ ||  | .  || 
|_|\/|_||  /_____//  `__ `     \____//   |_|\_|| 
`-`  `-`   `-----`   /_//       `---`    `-` -`  
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Text this: Fundamentals of geophysics. (2nd ed.)