If a rock is broken into smaller pieces by natural causes, geologists refer to this process as

Physical or mechanical weathering.

Explanation:

As the erosion of the rocks can take in many ways either by the wind or water or the temperatures and the breaking of the rocks in smaller pieces like that of the erosion by winds including the abrasion and the frost action, also pressure released by the organic activities.

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