Oceans
– Oceans: from Enchanted Learning
– Oceans, Label the Oceans Activity: from Enchanted Learning
– Ocean Animal printouts: from Enchanted Learning
– Ocean Crafts: from Enchanted Learning
– Ocean Printouts and Activities: from Enchanted Learning
– Ocean Table Activity, Reading and Understanding Information from a Table: from Enchanted Learning
Olympics: special exhibit of Perseus Digital Library Project
– Ancient and Modern Olympic Sports
– Athletes’ Stories
– Context of the Games & the Olympic Spirit
– Frequently Asked Questions
– Tour of Ancient Olympia
Oregon Trail
– Oregon Trail lesson Plan: grades K-2, from Edsitement
– Oregon Trail lesson plan: grades 3-5, from Edsitement
– Oregon Trail lesson Plan: grades 6-8, from Edsitement
– Oregon Trail teacher resources and lesson plans: from A to Z Teacher stuff
– Oregon Trail games free online: from archive.org
Origami downloadable instructions: from Origami USA