Fact 1: Extreme heat and pressure change rock into metamorphic rock.

Fact 2: Gneiss Rocks Gneiss Rocks Gneiss rocks are metamorphic.

Given the two facts above, answer the question "What changes rock into gneiss?" with the following options: 
- 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


 

       extreme heat and pressure  