Earth Sciences
- April 22 - Trees have a theoretical maximum height of 130m (426 ft) before gravity restricts their growth, according to a study published in Nature.
- September 28 - A long awaited earthquake strikes Parkfield, California, the most closely monitored earthquake zone in the world. The earthquake, which had been expected to have occurred by the late 1980s, strikes as a magnitude 6.0. The network of instruments that had been installed in the region make this the most well-recorded earthquake in history.
- December 26 - Indian Ocean earthquake and tsunami.
Read more about this topic: 2004 In Science
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