Metamorphic rocks start as one type of rock and—with pressure, heat, and time—gradually change into a new type of rock.
5 - 8
Earth Science, Geology
Metamorphic rock, estimated to be as old as 3.8 billion years, located near Isua at Qorqut Sound, Greenland.
Photograph by James L. Amos
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July 15, 2022
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