Ais the icicle-like speleothem that grows down from the roof of a cavern.

A stalactite  is the icicle-like speleothem that grows down from the roof of a cavern.

Hope I helped.

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