Metamorphic rocks whose minerals are arranged in layers or bands are called -

Argon, carbon-14, and carbon-12

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

Maybe on the physical part? i dunno i just guessed plus i really need the points