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Powell focuses on three major breakthroughs in understanding. The first has to do with the age of the earth, which had been guessed at through such things as biblical genealogies and the poorly understood fossil record. Thanks to the development of tools to gauge isotopic dating and other indexes, the solar system and our own planet are known to be 4.5 billion years old. The second has to do with the understanding of plate tectonics, which explains what were mysteries of geomorphology, proposing a "motor" for geological processes. The third, far less widely known than the first two, has to do with the history of meteoritic collisions with the earth--collisions that may have put the moon in the sky.
"If at first the idea is not absurd, then there is no hope for it," Albert Einstein once remarked. Powell offers a readable overview of three theories that were once scorned by the scientific establishment and that now underlie contemporary geological thought. --Gregory McNamee
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