Coastal & Marine Geology InfoBank

Home FACS Activities Atlas Geology School Related Sites More

USGS CMG InfoBank: Plates and Lava Lakes

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: 23:40 - 24:25 (00:45)
Source: Annenberg/CPB Resources - Earth Revealed - 2. The Restless Planet
Keywords: "plate tectonics", plate, mantle, convection, "lava lake"

Our transcription: The central idea of plate tectonics is simple.
The Earth's crust and upper mantle are broken into about a dozen large rigid plates, somewhat like segments of cracked shell on a hardboiled egg.
These gigantic slabs of rock slip and slide as they are carried about by the convection currents in the partially molten layer of the upper mantle.
A similar pattern of crustal plate motion is sometimes observed on the surface of molten lava lakes.
The cooled skin of lava across the lake is broken into plates by the turbulent liquid beneath.

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 04:25:17 PDT 2013  (chd)