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Unit 3 Lesson 2 The Rock Cycle
Classified Information!
What are the classes of rocks?
• Igneous rock forms when magma cools and
hardens. It forms on or beneath Earth’s surface.
• Sedimentary rock forms when sediment from
older rocks or minerals that form from solutions
get pressed and cemented together.
• Metamorphic rock forms when pressure,
temperature, or chemical processes change
existing rock.
Copyright © Houghton Mifflin Harcourt Publishing Company
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