To label the arrow from the picture of obsidian to the picture of slate, the student should use the term "Metamorphic Transformation" or "Metamorphism." This reflects the geological processes involved, as slate is a metamorphic rock that forms from the alteration of shale (a sedimentary rock), while obsidian is an igneous rock formed from cooled lava. The arrow signifies a transformation rather than a direct lineage.
Which label should the student add to an arrow from the picture of obsidian to the picture of slate
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