1. which of earth’s spheres contain most of its mass? a. atmosphere b. hydrosphere c. geosphere d. biosphere

C.Geosphere... thats the answer

Geosphere should be the correct answer

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

He want to contact the red cross/red crescent because they are the main non profit organization that deals with disasters around the world