Curated OER
Unesco: Gambia: Stone Circles of Senegambia
The site consists of four large groups of stone circles that represent an extraordinary concentration of over 1,000 monuments in a band 100 km wide along some 350 km of the River Gambia. The four groups, Sine Ngayene, Wanar, Wassu and...
Curated OER
Educational Technology Clearinghouse: Clip Art Etc: A Babylonian Map of the World
A tablet of dark brown clay, much injured, dating from the 8th or 7th century B.C. The two large concentric circles indicate the ocean, or, as it is called in the cuneiform writing between the circles, the 'Briny Flood.' Beyond the ocean...
Curated OER
Etc: Maps Etc: Europe on a Conic Projection, 1915
A map of Europe on a simple conic projection showing straight meridians or lines of longitude, and concentric circular parallels or lines of latitude.
Curated OER
Science Kids: Science Images: Fraser Spiral Illusion, False Spiral
This optical illusion image is known as a Fraser spiral illusion, or false spiral. The black arcs appear to form a spiral when in fact they are a series of concentric circles.
Curated OER
Unesco: Indonesia: Borobudur Temple Compounds
This famous Buddhist temple, dating from the 8th and 9th centuries, is located in central Java. It was built in three tiers: a pyramidal base with five concentric square terraces, the trunk of a cone with three circular platforms and, at...
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