Coastal & Marine Geology InfoBank

Home FACS Activities Atlas Geology School Related Sites More

USGS CMG InfoBank: The Crust is Different

Skip navigational links
Loading
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: 10:58 - 11:36 (00:38)
Source: Annenberg/CPB Resources - Earth Revealed - 2. The Restless Planet
Keywords: crust, "Earth's formation", granite

Our transcription: But rocks forming the outermost layer of Earth today are much different in composition from that of many meteorites.
For example, a common continental rock is granite, which is lighter in weight than meteoritic material.
This suggests that this planet must have originally had a very different structure than it has today.
Scientists believe that initially it was a homogeneous blob of silicon compounds, iron, magnesium oxides, and lesser amounts of all the other natural chemical elements.

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 USA.gov logo U.S. Department of the Interior | U.S. Geological Survey
URL: http://walrus.wr.usgs.gov/infobank/programs/html/school/moviepage/02.01.18.html
Page Contact Information: InfoBank staff
Page Last Modified: Thu Oct 31 04:25:12 PDT 2013  (chd)