Coastal & Marine Geology InfoBank

Home FACS Activities Atlas Geology School Related Sites More

USGS CMG InfoBank: Layers of the Earth

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: 13:35 - 14:31 (00:56)
Source: Annenberg/CPB Resources - Earth Revealed - 2. The Restless Planet
Keywords: "Don L. Anderson", "inner core", "outer core", mantle, crust

Our transcription: Geophysicists have developed a remarkably clear picture of Earth's interior.
At the very center of the Earth, we have a solid inner core which is frozen iron.
It's about the size of the moon.
It's a crystalline ball just floating at the center of the earth.
Outside of that is the molten outer core.
This is liquid iron, very low viscosity, and as I mentioned, the inner core is just floating inside this molten iron ball.
Then, as we get to about half the radius of the Earth, we enter the solid mantle.
This is a silicate rock.
Most of the Earth is made out of mantle.
About 70 percent of the Earth is the mantle.
This is inaccessible except by seismic waves although once in a while a piece of the mantle gets shoved up on top of the crust, and we can look at it.
Then, the part of the Earth that everybody's familiar with is the crust, and that's where we live on.
That's where we get our resources.
That's what we mine, but it's only a very thin scum on top of the mantle.

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/02.01.22.html
Page Contact Information: InfoBank staff
Page Last Modified: Thu Oct 31 04:25:13 PDT 2013  (chd)