Question

1. 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?

a rocks dont form; they stay as they are.
b it melted and cooled.
c it broke into sediment and then compacted.
d it was heated and put under pressure.

Explanation:

Metamorphic rocks form when existing rocks (igneous, sedimentary, or other metamorphic) are subjected to heat and pressure. Option a is incorrect as rocks can change form. Option b describes igneous rock formation (melting and cooling). Option c describes sedimentary rock formation (sediment compaction). Option d correctly describes metamorphic rock formation (heating and pressure).

Answer:

d. It was heated and put under pressure.