The appropriate label for an arrow from the picture of obsidian (which is an igneous rock) to the picture of slate (which is a metamorphic rock) would be "heat and pressure." This indicates the process that transforms materials into metamorphic rock, in this case, slate from sedimentary rocks. Obsidian is not directly transformed into slate, but the correct label would denote the general pathway of rock transformation in the geological cycle.
Which label should the student add to an arrow from the picture of obsidian to the picture of slate?
pressure and cementation or years of erosion or heat and pressure or cooling?
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