5. On vacation at a lake, Saira's mom sees an interesting-looking rock formation. Saira just learned about rocks in geology class and tells her mom that the formation is made of gneiss, a type of metamorphic rock. How did this metamorphic rock form?
a. Rocks don't form; they stay as they are.
b. It melted and cooled.
C. It broke into sediment and then compacted. It was heated and put under pressure.
