Source: Annenberg/CPB Resources - Earth Revealed - 18. Metamorphic Rocks
Keywords: "snowball garnet", geologist, crystalline, collision, orogeny, "geologic time", "plate tectonics"
Our transcription: Like a tiny black box flight recorder in an airplane or a trip odometer in a car, a snowball garnet provides geologists with a crystalline log of plate collision and mountain building spanning millions of years.
Geology School Keywords
U.S. Department of the Interior | U.S. Geological Survey URL: http://walrus.wr.usgs.gov/infobank/programs/html/school/moviepage/17.01.32.html Page Contact: InfoBank staff Page Last Modified: Tue Dec 16 06:31:52 PST 2008 (wcs)