Coastal & Marine Geology InfoBank

USGS CMG InfoBank: Impact of Magnetic Reversals


Dictionaries:	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 formal metadata lines metadata NGDC port stops project/theme region ship stations time virtual globe year
Data Types:	bathymetry geodetic positioning gravity ground penetrating radar imagery LIDAR magnetics metering equipment navigation samples seismic definitions disclaimer
Data Formats:	ARC coverage E00 FGDC metadata gridded/image imaging material scattered/swath Shapefile vector/polygon

Comment: 25:38 - 26:01 (00:23)

Source: Annenberg/CPB Resources - Earth Revealed - 3. Earth's Interior

Keywords: "James Sadd", "magnetic reversal", "magnetic north pole", migration, "solar radiation"

Our transcription: The discovery that the Earth's magnetic field is turned off briefly during a reversal raises some profound questions.

How long is the Earth without a magnetic field?

How does a reversal affect animals who depend on the Earth's magnetic field for navigation during their migrations?

Does the loss of field strength cause an increase in potentially deadly solar radiation?

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/03.01.34.html
Page Contact: InfoBank staff
Page Last Modified: Wed Aug 27 06:13:50 PDT 2008 (wcs)

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/03.01.34.html Page Contact: InfoBank staff Page Last Modified: Wed Aug 27 06:13:50 PDT 2008 (wcs)