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| Description: a) This close-up image taken by the rover Opportunity shows a small section of rock layers in a location, called The Dells. The angled and curved layering seen here is created only on Earth by water flow, strongly suggesting that this sediment was also deposited by water. The nearly spherical rocks, called “blueberries,” because they are dark, have been chemically identified as hematite, an iron-rich mineral that is usually formed in water. The rovers have found blueberries strewn in a wide variety of locations. Picture Stats: Views: 864 Filesize: 552.42kB Height: 900 Width: 1152 Source: https://biology-forums.com/index.php?action=gallery;sa=view;id=16088 |