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ERIC Number: EJ722794
Record Type: Journal
Publication Date: 2004
Pages: 2
Abstractor: ERIC
Reference Count: 4
ISSN: ISSN-0887-2376
Making An Impact: Shatter Cones
Blank, Lisa M.; Plautz, Michael R.; Crews, Jeffrey W.
Science Scope, v28 n3 p40-42 Nov-Dec 2004
In 1990, a group of geologists discovered a large number of shatter cones in southwestern Montana. Shatter cones are a type of metamorphosed rock often found in impact structures (the remains of a crater after a meteor impact and years of Earth activity). Scientists have discovered only 168 impact craters around the world. If rocks could talk, they would be able to tell the story of the events that formed them. But because they can't, geologists must use rocks as clues to reconstruct Earth's history. For this science exploration, we began by discussing some of the very questions geologists sought to answer at the Beaverhead, Montana, site. Beyond the shatter cones, there was no visible evidence of a meteor crater. Geologists wondered: How big was the impact crater? Where was the actual impact center? How long ago did the impact occur? Why can't you see a crater today?
National Science Teachers Association, 1840 Wilson Boulevard, Arlington, VA 22201-3000. Tel: 800-722-6782 (Toll Free); Web site:
Publication Type: Journal Articles; Reports - Evaluative
Education Level: Middle Schools
Audience: N/A
Language: English
Sponsor: N/A
Authoring Institution: N/A
Identifiers - Location: Montana