Until modern times, most countries were ruled by

Most people followed Gods, and their religion, but most communties were just divided into lower and upper class, and the upper class was there just becuase they lived closer to the city temples. Until modern times, religion ruled.

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

Answer feldspar,quartz,mica and amphibole;