5. on vacation at a lake, sairas mom sees an interesting - looking rock formation. saira just learned about…
5. on vacation at a lake, sairas 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?\na rocks dont form; they stay as they are.\nb it melted and cooled.\nc it broke into sediment and then compacted.\nd it was heated and put under pressure.
Answer
Brief Explanations:
Metamorphic rocks form when existing rocks are subjected to high - heat and high - pressure conditions, which cause physical and chemical changes. Option a is incorrect as rocks do change and form through various geological processes. Option b describes the formation of igneous rocks (melted and cooled). Option c describes the formation of sedimentary rocks (breaking into sediment and compaction). Gneiss, a metamorphic rock, forms due to heat and pressure.
Answer:
D. It was heated and put under pressure