Coastal & Marine Geology InfoBank

USGS CMG InfoBank: Gravimeter


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Comment: 16:50 - 17:19 (00:29)

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

Keywords: iron, salt, gravimeter

Our transcription: Gravimeters have also proven useful in detecting high density iron ore deposits and low density bodies of salt hidden from view.

At the heart of a gravimeter is a spring with a weight attached to its end.

The stronger the pull of gravity, the more the spring is extended.

This extension, a function of gravity, is accurately measured by the gravimeter.

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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/03.01.23.html Page Contact: InfoBank staff Page Last Modified: Wed Aug 27 06:13:47 PDT 2008 (wcs)