Coastal & Marine Geology InfoBank

Home FACS Activities Atlas Geology School Related Sites More

USGS CMG InfoBank: Source of the Earth's Magnetic Field

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: 17:19 - 18:07 (00:48)
Source: Annenberg/CPB Resources - Earth Revealed - 3. Earth's Interior
Keywords: magnetism, "James Sadd", "magnetic field"

Our transcription: Magnetism provides more indirect information about the interior of the Earth.
The Earth is a giant magnet. Its magnetic field is generated within the core and acts exactly as if a giant bar magnet were present at the center of the Earth.
All magnets are surrounded by magnetic lines of force.
If I cover this magnet with a piece of paper and sprinkle iron filings on top, the magnetic lines of force become easily visible.
The magnetic lines of force that surround the Earth are capable of aligning the magnetic fields in rocks in the same way that they align the needle of a compass.

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 04:25:24 PDT 2013  (chd)