View Full Version : History of the Earth's Atmosphere Written in Rocks

2005-Sep-07, 03:07 PM
SUMMARY: Geologists have built up a suite of tools and techniques that let them peer back in time to watch the formative stages of the Earth and how it's changed over time - by looking inside rocks. By analyzing trapped water and air in rocks, geologists are studying how our atmosphere changed 3.9 billion years ago, when the crust of the planet was just forming, and there wasn't any oxygen in the air.

View full article (http://www.universetoday.com/am/publish/history_atmosphere_rocks.html)
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