Coastal & Marine Geology InfoBank

Home FACS Activities Atlas Geology School Related Sites More

USGS CMG InfoBank: Chemical Weathering

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: 05:41 - 06:42 (01:01)
Source: Annenberg/CPB Resources - Earth Revealed - 15. Weathering and Soils
Keywords: "mechanical weathering", weathering, "chemical weathering", disintegration, "ice wedging", "Earth's surface", "tectonic activity", "rock composition", crystal, quartz, feldspar, "ferromagnesium mineral"

Our transcription: The term, "mechanical weathering," or "disintegration," describes the natural break up or fragmentation of rock at the earth's surface.
A chunk of granite, for example, may be broken up into smaller pieces by ice wedging or tectonic activity.
But this doesn't change the composition of the rock.
It's still granite.
It still consists of its original crystals of quartz, feldspar, and ferromagnesium minerals.
Contrast this with the other main form of weathering.
"Chemical weathering", which has a much more drastic effect on rock, although the two types of weathering are interrelated.
By breaking rocks into smaller pieces, mechanical weathering increases the amount of exposed surface.
This hastens the chemical weathering of the entire rock.

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 04:26:50 PDT 2013  (chd)