HiRISE: Lava-coated craters

tumblr_pbmh8mHvyb1rlz4gso1_1280Lava-coated craters. The larger crater looks normal–dimpled depression with a protruding rim barely covered by lava which later deflated. The smaller depression looks deeper and steeper-sided, and the rim does not protrude, so it is probably below the level of even the deflated lava. So why did this deflate so much?

Beautiful Mars series. [More at links]

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