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Unit 3 Lesson 2 The Rock Cycle
Let’s Rock!
What is rock?
• Rock is a naturally occurring solid mixture of one
or more minerals that may also include organic
matter.
• Most rock is made of minerals, but some rock is
made of nonmineral material that is not organic,
such as glass.
• Rocks are always changing through time.
Copyright © Houghton Mifflin Harcourt Publishing Company
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