How long does it usually take for a rock to be transformed from one rock type into another?

a.
a few days

b.
from 300 to 400 years

c.
about one thousand years

d.
thousands to millions of years

Your answer is C - about a thousand years.

So  if  the sum of the enthalpies of the reactants is greater than the products, the  reaction  will be  exothermic.  if  the products side has a larger enthalpy, the  reaction  is  endothermic. you may wonder why  endothermic reactions, which soak up energy or enthalpy from the environment, even happen

Answergoogle earth; i believe this is the correct answer, plz check first;