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Half Crater

This remarkable half crater called Balch is located in the rift between Rhea and Theia Montes in Beta Regio. (Radar illumination is from the left. ) About 37 km (23 mi) in diameter, Balch has been cut by many fractures or faults since it was formed by the impact of a large meteorite. The eastern portion was partially destroyed during the formation of a fault-valley, which measures up to 20 km (12 mi) wide. A north-south profile through the center of this crater resulted from the downdropping and removal of most of the eastern half of the crater.

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