You are presented with the question "What changes rock into gneiss?" and the following answer choices: 
- weak heat and low pressure
 - The bending of a ray of light
 - extreme cold and pressure
 - heat is produced
 - movement of tectonic plates
 - tectonic plates being pushed together
 - extreme heat and pressure
 - extreme heat and no pressure

Now knowing that extreme heat and pressure change rock into metamorphic rock and gneiss Rocks Gneiss Rocks Gneiss rocks are metamorphic, choose the best answer.


 

       extreme heat and pressure  