Coastal & Marine Geology InfoBank

USGS CMG InfoBank: An Oxygen Rich Atmosphere


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Comment: 19:17 - 19:54 (00:37)

Source: Annenberg/CPB Resources - Earth Revealed - 2. The Restless Planet

Keywords: "blue-green algae", cyanobacteria, oxygen, atmosphere

Our transcription: Primitive blue green algae or cyanobacteria survived by taking one of the most abundant gases released by volcanoes, carbon dioxide, and combining it with water in the presence of sunlight.

The result is carbohydrates used for food and an important waste product called oxygen.

So through time early life forms helped to change the carbon dioxide rich atmosphere to one rich in oxygen, thus permitting the evolution of modern life.

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Accessibility FOIA Privacy Policies and Notices
U.S. Department of the Interior \| U.S. Geological Survey URL: http://walrus.wr.usgs.gov/infobank/programs/html/school/moviepage/02.01.31.html Page Contact: InfoBank staff Page Last Modified: Fri Sep 18 02:35:38 PDT 2009 (wcs)