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The Learning Kingdom's Cool Word of the Day for July 6, 1999
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petroglyph [n. PET-ruh-glif]
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Throughout the American southwest there are art works carved by Native
Americans into the dark-colored "rock varnish" that forms on stone surfaces
in the desert. These are petroglyphs, images carved into the surfaces of
stones. (If an image was painted on a rock, then it is a pictograph [n.
PIK-tuh-graf].)
The word is a compound from the Latin petra (stone) and the Greek gluphe
(carving). Both of these are from roots that gave us many English words.
More "stony" words:
petroleum: oil (oleum, in Latin) that comes from rocks
petrify: turn to stone
saltpetre: potassium or sodium nitrate, "salt of the rock"
A great place to see some petroglyphs:
http://www.nps.gov/petr/
Another kind of glyph is a hieroglyph:
http://www.cool-word.com/archive/1998/08/13.html
Today's Cool Fact is about rock varnish:
http://www.cool-fact.com/archive/1999/07/06.html
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