Coastal & Marine Geology InfoBank

Home FACS Activities Atlas Geology School Related Sites More

USGS CMG InfoBank: Forming an Atmosphere

Skip navigational links
Dictionaries: Our Mapping Systems   The USGS and Science Education   USGS Fact Sheets   Topics   Keywords   Data Dictionary   Metadata Dictionary   Computer Terminology   Digital Formats  
InfoBank Terms: Activity ID   activity overview   crew   digital data   formal metadata   lines   metadata   NGDC   port stops   project/theme   region   ship   stations   time   virtual globe   year  
Data Types: bathymetry   biological   geochemical   gravity   ground penetrating radar   imaging   LIDAR   logs   magnetics   metering equipment   navigation   samples   seismic   total station   definitions disclaimer  
Data Formats: ARC coverage   E00   FGDC metadata   gridded/image   imaging   material   scattered/swath   Shapefile   vector/polygon  
Comment: 15:29 - 16:20 (00:51)
Source: Annenberg/CPB Resources - Earth Revealed - 2. The Restless Planet
Keywords: volcanism, atmosphere, "David Stevenson"

Our transcription: The great amount of heat still present in the Earth is demonstrated by active volcanoes.
The volcanoes of today are an awesome spectacle, but more feverish convulsions affected this planet when the Earth was young.
In the present Earth, the amount of liquid rock is really quite small at any time, but in the early Earth a big fraction of the volume would have been molten, so we imagine that the very earliest Earth had an extremely high level of volcanic activity.
When this volcanic activity takes place, gases which are dissolved within the liquid rock are expelled, put into the Earth's atmosphere, and, in this way, we can imagine that the early atmosphere of the Earth was built up by volcanic activity.

Geology School Keywords
Skip footer navigational links

Coastal and Marine Science Centers:  Pacific   St. Petersburg   Woods Hole  
InfoBank   Coastal and Marine Geology Program   Geologic Information   Ask-A-Geologist   USGS Disclaimer  

Accessibility FOIA Privacy Policies and Notices

Take Pride in America logo logo U.S. Department of the Interior | U.S. Geological Survey
Page Contact Information: InfoBank staff
Page Last Modified: Thu Oct 31 04:25:14 PDT 2013  (chd)