21. What are fossils, and why are they found only in sedimentary rock?

Fossils are the remains of once-living things. As the plant or animal dies, it may be covered by layers of sediment. After millions of years, a fossil may form.

23. How is metamorphic rock formed?

Metamorphic rocks form from the heat & pressure deep inside Earth.

24. How are metamorphic rocks classified?

METAMORPHIC ROCKS are classified according to the arrangement of the grains that make up the rock & the minerals in them.

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Unit I Rocks/Mineral

Unit I: Rocks/Minerals

Question	Answer
21. What are fossils, and why are they found only in sedimentary rock?	Fossils are the remains of once-living things. As the plant or animal dies, it may be covered by layers of sediment. After millions of years, a fossil may form.
23. How is metamorphic rock formed?	Metamorphic rocks form from the heat & pressure deep inside Earth.
24. How are metamorphic rocks classified?	METAMORPHIC ROCKS are classified according to the arrangement of the grains that make up the rock & the minerals in them.