Earth Science Quiz
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EARTH SYSTEM SCIENCE FOUNDATIONS
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The diagram illustrates the rock cycle. A geologist observes a gneiss, a high-grade metamorphic rock, that contains zircons dated to 450 million years ago. This gneiss is in direct contact with an overlying layer of sandstone containing fossils from 300 million years ago. Which pathway on the diagram best represents the history of the rock that formed the gneiss, prior to the deposition of the sandstone? 
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