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Satellites of the Outer Planets - Ganymede

Satellites of the Outer Planets - Ganymede

High crater counts indicate this is the oldest terrain on Ganymede. High-resolution images reveal that the geology of this terrain is exceedingly complex.

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11. Polders and Dikes Along the North Sea, the Netherlands

11. Polders and Dikes Along the North Sea, the Netherlands

Polders are land reclaimed from the sea, with dikes turning estuaries into lakes. Dikes isolate land, and pumping exposes the sea bottom. Over 7800 sq km has ...

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