relative age, What do words like older, oldest, younger and youngest describe?, mineral, The natural occuring substance that make up rocks that are neither plants nor animals, rock cycle, This is the never-ending process in which rocks are changed from one type into another., igneous, A rock formed from hot, molten rock material that has cooled and hardend., sedimentary, Rocks formed from smaller bits of rocks cemented together., metamorphic, A rock that has been changed by heat or pressure (or both).

Chapter 5 Lesson 1

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