![Striations carved into a bedrock by ice erosion as a glacier receded, Isua Greenstone Belt, Greenland Striations carved into a bedrock by ice erosion as a glacier receded, Isua Greenstone Belt, Greenland](https://windows10spotlight.com/wp-content/uploads/2017/08/45aab3901e65b64be4e3952e613dd927-1024x576.jpg)
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![8dde422d5b2dc551dec8a3bc51862ed5 8dde422d5b2dc551dec8a3bc51862ed5](https://windows10spotlight.com/wp-content/uploads/2017/08/8dde422d5b2dc551dec8a3bc51862ed5-576x1024.jpg)
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How was this rock formed and what minerals make up it’s composition?
the light and dark lines in the rock are not striations but layering in the rock itself.