Which process is responsible for the formation of metamorphic rocks?
- Cooling of lava
- Deposition of sediments
- Heat and pressure
- Volcanic eruption
Answer: Heat and pressure
Metamorphic rocks form when existing rocks (igneous, sedimentary, or other metamorphic) are subjected to high heat and pressure without melting. This changes their mineral composition and texture. Examples: marble (from limestone), slate (from shale).