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Northumberland: 360 Virtual Tour
Visit over 40 different places in Britian with spectacular views of prehistoric rock art formations.
Khan Academy
Khan Academy: Gems and Their Creation
A gem is a precious or semiprecious stone that has been cut, polished, engraved, or otherwise altered to be used as a personal insignia for making sealings or as decoration. Often imported from afar, ancient gems were truly exotic, and...