The nature of the terrain jumps out when orbiter camera images are draped over a digital terrain model created with those images. At the center of the province is an irregular depression that might well be a caldera and at its edges are domes with features that suggest they were formed by the intrusion of high-viscosity silicic lava, a type of lava rare on the Moon. Any model of the Moon's thermal evolution must now be able to account for this volcanic province as well as the familiar mare. Credit: Perspective view looking to the northeast, generated with a WAC 100-m-per-pixel image draped over the GLD100 (100-m-per-pixel) digital terrain model developed by F. Scholten, DLR. NASA/GSFC/ASU/WUSTL.
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