The rock cycle describes how rocks transform from one type to another through geological processes. Igneous rocks form from cooling magma, sedimentary
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Can a rock directly transform from igneous to metamorphic without becoming sedimentary first?
Yes. If an igneous rock is buried deep underground near a magma chamber or in a collision zone, it experiences heat and pressure, transforming directly into metamorphic rock without intermediate weathering and sedimentation steps.
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Why are diamonds found in metamorphic and igneous rocks but not sedimentary rocks?
Diamonds form under the extreme heat and pressure found deep within Earth or during metamorphism of carbon-containing rocks. These conditions do not exist during sedimentary rock formation near the surface, so diamonds are not found in sedimentary rocks in nature.
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How do geologists determine the history of a rock using the rock cycle?
By examining mineral composition, crystal structure, and fossils, geologists infer what type of rock it is and what processes formed it. Seeing metamorphic textures indicates deep burial. Fossils indicate sedimentary origin. Working backwards through the rock cycle, they reconstruct the rock's journey.
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