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Glossary of Terms & Definitions | I |
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| Ice Age | The cold period between 110,000 and 10,000 years ago when polar icecaps expanded and the sea level fell by up to 500 feet. |
| iconic | Resembling the figurative or representational form of an object from the real or imagined world. |
| iconography | Collected visual representations or imagery relating to a particular subject, style, or body of art. |
| intaglio | see geoglyph |
| interstadial | A short warm period between two colder periods of glaciation. |
| inuksuit | Standing stones constructed in the Arctic. |
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