Review - annotate the Spurn Head
picture with key characteristics of a
spit.

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

Answermost of the time it would be ground into fine sediment,and sometimes they are carried away from the original location;