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

Fact 2: Slate is an example of a metamorphic rock.

Given the two facts above, answer the question "Extreme heat and pressure change rock into what?" with the following options: 
- electricity
 - mines
 - slate
 - iron
 - soils
 - calcite
 - water
 - complex


 

   slate      