Wrinkle ridges, formed when the volcanic plains were pushed together and buckled, encircle a network of troughs or graben formed when the volcanic plains were stretched and pulled apart. The wrinkle-ridge ring, about 100 km in diameter, is formed over the rim of a ghost crater, an impact crater that was flooded and buried by lava flows.
Image Number: WEB12644-2012
Credit: NASA/Johns Hopkins University Applied Physics Laboratory/Carnegie Institution of Washington/Smithsonian Institution
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