Coastal & Marine Geology InfoBank

Home FACS Activities Atlas Geology School Related Sites More

USGS CMG InfoBank: Tides

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: 21:35 - 22:41 (01:06)
Source: Annenberg/CPB Resources - Earth Revealed 24, Waves, Beaches and Coasts
Keywords: ocean, wave, tide, Moon, Sun, Earth, gravity

Our transcription: Regardless of how the battle over seawalls and sediment supply eventually turns out, coastal dwellers will always have to deal with incursions from the oceans.
In addition to problems caused by crashing waves, there are a number of other factors that affect the level of the water.
The most familiar is the action of the "tides."
Tides are primarily the work of the moon, and to a lesser degree, the Sun.
As the moon orbits the Earth, it exerts a powerful gravitational pull.
This causes the ocean on the side of the Earth facing the Moon to bulge out slightly.
Another tidal bulge occurs on the other side of the planet as water lags behind due to weaker gravitational attraction.
These bulges create a high tide.

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/22.01.22.html
Page Contact Information: InfoBank staff
Page Last Modified: Thu Oct 31 04:27:57 PDT 2013  (chd)