Fact 1: Extreme heat and pressure change rock into metamorphic rock. Fact 2: Slate is a metamorphic rock. Given the two facts above, what do extreme heat and pressure create?

Available choices:
[i] wetness;
[ii] slate;
[iii] time;
[iv] desire;
[v] forces;
[vi] cracks;
[vii] Energy.;
[viii] energy;
Answer:
[ii]