HiRISE: Gigas Sulci

ESP_040661_1890A sulcus (or sulci, plural) is defined as “subparallel furrows and ridges.” This is a purely descriptive term for landforms that could have a variety of origins.

At this location it appears to be a graben (which is a fault-bounded valley) on a large scale, and locally (such as in this image) became a vent region for…. [More at link]

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