What evidence have you gathered in this unit that the outer earth moves? what evidence do you have that the interior portion of the earth is in motion?

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 sinking and cooled;

Answer the use of flood plains and irrigation;